From Middle English hed meaning “head”, from Old English heafod. It may have referred to a person who had a peculiar head, who lived near the head of a river or valley, or who served as the village headman.
From Chinese 何 (hé), representing a southern pronunciation of the name of the ancient state of Han (see Han). After Han was destroyed by the state of Qin, those who resettled further south changed their name to this character in order to match the local pronunciation.
From various English place names that were derived from Old English hæg meaning “enclosure, fence”. A famous bearer was American President Rutherford B. Hayes (1822-1893).