Biblical name (apparently meaning ‘talkative’ in Hebrew) borne by a character mentioned in a genealogy (Genesis 36:11). It has been occasionally used from Puritan times down to the present day, especially in America. More often, however, it is of Arabic origin, as in the case of the film actor and international bridge player Omar Sharif (b. 1932 in Egypt).
English: habitational name from any of various places, for example in Cumbria, Derbyshire, County Durham, Warwickshire, and Worcestershire, named Blackwell, from Old English blæc ‘black’, ‘dark’ + wæll(a), well(a) ‘spring’, ‘stream’.