Edited by Azizi Powell
This pancocojams post provides information about the etymology of the last name (surname) "Moore" and its frequency in the United States, particularly with Black Americans.
The content of this post is given for etymological purposes.
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Thanks to all those who are quoted in this post.
Click http://pancocojams.blogspot.com/2017/12/etymology-of-last-name-jones-its.html for the somewhat related post on the etymology of the last name "Jones" & its frequency in the USA.
Also, click http://pancocojams.blogspot.com/2016/02/washington-blackest-last-name-in-united.html for a related 2016 pancocojams post entitled "Washington"- The Blackest Last Name In The United States.
ETYMOLOGY OF THE LAST NAME "MOORE"
"Moore is a popular English-language surname. It is the 34th most common surname in Australia, 32nd most common in England, and was the 16th most common surname in the United States in 2000.
It can have several meanings and derivations, as it appeared as a surname long before written language had developed in most of the population, resulting in a variety of spellings.
Variations of the name can appear as O'More or Moor; as well as the Scottish Gaelic originations Muir, Mure and Mor/Mór; the Manx Gaelic origination Moar; the Irish Gaelic originations O'More and Ó Mórda; and the later Irish variants O'Moore or 'Moore and the French de la Mora (William De La More).
The similarly pronounced surname Mohr is of Germanic lineage and is not related to the Gaelic/English variations.
Meanings and origins
From Middle English mor meaning "open land" or "bog" and given to persons dwelling near a moor or heath.
The Old Irish Moores are O'Morda, from the Irish Gaelic word morda, meaning "stately and noble". The French persons named de Mora, who were established in Ireland's Munster province, were known as O'More after 200 years in Co. Leix. After WW1, "Moore" as a phonetic rendering of the name derived from the word "moor", or "healthy mountain," became the written version for similar-sounding names. Alternatively of Gaelic/Manx origin Moar, this name was for a collector of manorial rents on the Isle of Man.
The spelling "Moore" was sometimes used to indicate a son of someone called More - this being one use where spelling is significant.
Possibly derived from Maurus, a Roman first name which meant "dark skinned" in Latin, and related to the Old French More meaning "Moor," such as Berber, a colloquial nickname for a person of dark complexion, often describing someone of North African descent.
Possibly originated from early references to persons who worked with boats at a wharf or moorage.
The De La Mare surname from French Normandy was progressively anglicized in England as "de la Mare" (Walter de la Mare), "De La More", "More", and "Moore" in England.
In the United States, "Moore" ranked 16th among all surnames in the 2000 census, accounting for 0.26% of the population, falling from 9th in the 1990 census.
INFORMATION ABOUT THE MOORS
"The term "Moors" refers primarily to the Muslim inhabitants of the Maghreb, the Iberian Peninsula, Sicily, and Malta during the Middle Ages. The Moors initially were the Berber autochthones of the Maghreb. The name was later also applied to Arabs.
Moors are not a distinct or self-defined people, and the 1911 Encyclopaedia Britannica observed that "The term 'Moors' has no real ethnological value." Medieval and early modern Europeans variously applied the name to Arabs, North African Berbers, and Muslim Europeans.
The term has also been used in Europe in a broader, somewhat derogatory sense to refer to Muslims in general, especially those of Arab or Berber descent, whether living in Spain or North Africa. During the colonial era, the Portuguese introduced the names "Ceylon Moors" and "Indian Moors" in Sri Lanka, and the Bengali Muslims were also called Moors.
In 711, troops mostly formed by Moors from North Africa led the Umayyad conquest of Hispania. The Iberian peninsula then came to be known in classical Arabic as Al-Andalus, which at its peak included most of Septimania and modern-day Spain and Portugal.
In 827, the Moors occupied Mazara on Sicily, developing it as a port. They eventually consolidated the rest of the island and some of southern Italy. Differences in religion and culture led to a centuries-long conflict with the Christian kingdoms of Europe, which tried to reclaim control of Muslim areas; this conflict was referred to as the Reconquista. In 1224 the Muslims were expelled from Sicily to the settlement of Lucera, which was destroyed by European Christians in 1300.
The fall of Granada in 1492 marked the end of Muslim rule in Iberia, although a Muslim minority persisted until their expulsion in 1609.
During the classical period, the Romans interacted with, and later conquered, parts of Mauretania, a state that covered modern northern Morocco, western Algeria, and the Spanish cities Ceuta and Melilla. The Berber tribes of the region were noted in Classical literature as Mauri, which was subsequently rendered as "Moors" in English and in related variations in other European languages. Mauri (Μαῦροι) is recorded as the native name by Strabo in the early 1st century. This appellation was also adopted into Latin, whereas the Greek name for the tribe was Maurusii (Μαυρούσιοι). The Moors were also mentioned by Tacitus as having revolted against the Roman Empire in 24 AD.
The 16th century scholar Leo Africanus (c. 1494–1554) of Al-Andalus identified the Moors as the native Berber inhabitants of the former Roman Africa Province (Africans). He described Moors as one of five main population groups on the continent alongside Egyptians, Abyssinians (Abassins), Arabians and Cafri (Cafates).
In medieval Romance languages, variations of the Latin word for the Moors (for instance, Italian and Spanish: moro, French: maure, Portuguese: mouro, Romanian: maur) developed different applications and connotations. The term initially denoted a specific Berber people in western Libya, but the name acquired more general meaning during the medieval period, associated with "Muslim", similar to associations with "Saracens". During the context of the Crusades and the Reconquista, the term Moors included the derogatory suggestion of "infidels".
Apart from these historic associations and context, Moor and Moorish designate a specific ethnic group speaking Hassaniya Arabic. They inhabit Mauritania and parts of Algeria, Western Sahara, Tunisia, Morocco, Niger, and Mali. In Niger and Mali, these peoples are also known as the Azawagh Arabs, after the Azawagh region of the Sahara.
The authoritative dictionary of the Spanish language does not list any derogatory meaning for the word moro, a term generally referring to people of Maghrebian origin in particular or Muslims in general. Some authors have pointed out that in modern colloquial Spanish use of the term moro is derogatory for Moroccans in particular and Muslims in general.
In modern, colloquial Portuguese, the term Mouro was primarily used as a designation for North Africans and secondarily as a derogatory and ironic term by northern Portuguese to refer to the inhabitants of the southern parts of the country (Lisbon, Alentejo, and Algarve). However, this designation has gained more acceptance in the south.
In the Philippines, a former Spanish colony, many modern Filipinos call the large, local Muslim minority concentrated in Mindanao and other southern islands Moros. The word is a catch-all term, as Moro may come from several distinct ethno-linguistic groups such as the Maranao people. The term was introduced by Spanish colonisers, and has since been appropriated by Filipino Muslims as an endonym, with many self-identifying as members of the Bangsamoro "Moro Nation".
Moreno can mean dark-skinned in Spain, Portugal, Brazil, and the Philippines. Also in Spanish, morapio is a humorous name for "wine", especially that which has not been "baptized" or mixed with water, i.e., pure unadulterated wine. Among Spanish speakers, moro came to have a broader meaning, applied to both Filipino Moros from Mindanao, and the moriscos of Granada. Moro refers to all things dark, as in "Moor", moreno, etc. It was also used as a nickname; for instance, the Milanese Duke Ludovico Sforza was called Il Moro because of his dark complexion.
In Portugal, mouro (feminine, moura) may refer to supernatural beings known as enchanted moura, where "moor" implies 'alien' and 'non-Christian'. These beings were siren-like fairies with golden or reddish hair and a fair face. They were believed to have magical properties. From this root, the name moor is applied to unbaptized children, meaning not Christian. In Basque, mairu means moor and also refers to a mythical people.”....
FREQUENCY OF THE LAST NAME "MOORE" AMONG BLACK AMERICANS
Most common last names for Blacks in the U.S. 
"The following is a list of the most common surnames for people who self-identified as "Black" in America during the 2000 Census [updated data]. The data, which may include people who identified themselves as African-American, African, or other ethnic or racial groups, is derived from the U.S. Bureau of the Census.
Last name / Surname: MOORE
Surname rank among blacks: 13
% of people with surname self-identifying as 'black': 26.9%
U.S. Rank: 16 "
From https://names.mongabay.com/race/2010/population-black.html 
Surname rank among blacks: 13
% black in genpop 2010: 27.74
% Total general population rank: 18 "
From http://pancocojams.blogspot.com/2015/05/50-most-common-african-american.html "50 MOST COMMON AFRICAN AMERICAN SURNAMES (Based on Births among Allegheny County, Pennsylvania Residents) During 1992-2001
"Note: Pittsburgh, Pennsylvania is the largest city in Allegheny County.
20. Moore (151) [# of Black babies* with the surname "Moore" who were born in Allegheny County during those years; "Black" defined as anyone of Black descent, included children of Black/non-Black birth parents]
A FEW FAMOUS BLACK AMERICANS WITH THE LAST NAME "MOORE"
These names are given in no particular order.
Reverend James Moore Sr. (February 1, 1956 – June 7, 2000), born James Leslie Moore in Detroit, Michigan, was a gospel artist well known throughout the gospel recording industry for his powerful vocal abilities https://en.wikipedia.org/wiki/James_Moore_(gospel_singer)
Arnold Dwight "Gatemouth" Moore (November 8, 1913 – May 19, 2004) was an American blues and gospel singer, songwriter, radio disc jockey, community leader and pastor, later known as Reverend Gatemouth Moore. https://en.wikipedia.org/wiki/Gatemouth_Moore
Jackie Moore (born 1946, Jacksonville, Florida) is an American R&B singer. She is best known for her gold single 1970 song "Precious, Precious," which reached #30 on the Billboard Hot 100 chart on March 6, 1971. This disc sold over one million copies, and received a gold disc awarded by the R.I.A.A. in March 1971. https://en.wikipedia.org/wiki/Jackie_Moore_(singer)
Rudolph Frank Moore (March 17, 1927 – October 19, 2008), known as Rudy Ray Moore, was an American comedian, musician, singer, film actor, and film producer. He was perhaps best known as Dolemite (the name derived from the mineral dolomite), the uniquely articulate pimp from the 1975 film Dolemite, and its sequels, The Human Tornado and The Return of Dolemite. The persona was developed during his earlier comedy records, for which Moore has been called "the Godfather of Rap". https://en.wikipedia.org/wiki/Rudy_Ray_Moore
"James Isaac Moore (January 11, 1924 – January 31, 1970),[nb 1] better known by his stage name Slim Harpo, was an American blues musician, a leading exponent of the swamp blues style, and "one of the most commercially successful blues artists of his day."... https://en.wikipedia.org/wiki/Slim_Harpo
"Bebe Moore Campbell (born Elizabeth Bebe Moore; February 18, 1950 – November 27, 2006), was an American author, journalist and teacher."...
Shemar Franklin Moore (born April 20, 1970) is an American actor and former fashion model."...[male] https://en.wikipedia.org/wiki/Shemar_Moore
Leonard Edward Moore (born November 25, 1933) is a former American football halfback. He played college football at Pennsylvania State University and professionally in the National Football League (NFL) for the Baltimore Colts from 1956 to 1967"...
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