| Background: The first example is the name of a Jew and is probably a diminutive of Isaac in its Hebrew form (Jacobs). Cock, a common personal name still in use about 1500, may partly be from Old English Cocc or Cocca, found in place-names, although not on independent record. But as cock became a common term for a boy, it may also have been used affectionately as a personal name.
Variations: Cox, Cocke, Cock, Heap, Haycock, Hillcock, Simcock, Wilcock.
More Info: http://heraldry.celticradio.net/search.php?id=27
Discussion of this family is welcomed.