Douglas is a name mostly associated with white males. I have never met a colored person named Doug.
Resist pandering democrats at it again....
It was his last name. Don’t know its origin; but many multigeneratioal American blacks with European last names can trace their lineage to enslaved ancestors who used the last name of the plantation owners upon emancipation (if they had a good relationship, or even a claim to have been fathered by the owner). Others took honorific names like Washington, Lincoln, or a nearby locale.
Well, you may not have met any black Dougs, but maybe you've heard of Doug Williams, the Washington Redskins back up quarterback who entered the 1988 Supebowl XXII game with the Redskins down in points and proceeded to pick apart the Denver Broncos in the second quarter. First black quarterback to enter and win the Superbowl. One hell of an exciting comback that set records.