Quick answer
Hamilton is a boy name.
Meaning and history
From a Scottish and English surname that was derived from Old English hamel "crooked, mutilated" and dun "hill". The surname was originally taken from the name of a town in Leicestershire, England (which no longer exists). A famous bearer of the surname was Alexander Hamilton (1755-1804), a founding father of the United States who was killed in a duel with Aaron Burr.
Notes and context
Usage: english