African-American heritage of presidents of the United States
Calvin Coolidge's mother Victoria Moor was claimed to be of a mixed-race family in Vermont. Vaughn noted that her surname was derived from "Moor", a European term for people of North Africa. He did not note that another meaning of her surname is the landscape feature of moor or bog. People's surnames were often based on such landscape features when surnames became generally adopted in 14th century England. Moor/Moore is a common name in England, Scotland, and Ireland.
Moors
The Inquisition was aimed mostly at Jews and Muslims who had overtly converted to Christianity but were thought to be practicing their faiths secretly. They were respectively called "marranos" and "moriscos". However, in 1567 King Philip II directed Moriscos to give up their Arabic names and traditional dress, and prohibited the use of Arabic. In reaction, there was a Morisco uprising in the Alpujarras from 1568 to 1571. In the years from 1609 to 1614, the government expelled Moriscos. The historian Henri Lapeyre estimated that this affected 300,000 out of an estimated total of 8 million inhabitants.