Why is the ninth month called September?
Old English hergian "make war, lay waste, ravage, plunder," the word used in the "Anglo-Saxon Chronicle" for what the Vikings did to England, from Proto-Germanic verb *harohan (cf. Old Frisian urheria "lay waste, ravage, plunder," Old Norse herja "to make a raid, to plunder," Old Saxon and Old High German herion, German verheeren "to destroy, lay waste, devastate"), from *harjaz "an armed force" (cf. Old English here, Old Norse herr "crowd, great number; army, troop," Old Saxon and Old Frisian heri, Dutch heir, Old High German har, German Heer "host, army," Gothic harjis), from PIE root *koro- "war" (cf. Lithuanian karas "war, quarrel," karias "host, army;" Old Church Slavonic kara "strife;" Middle Irish cuire "troop;" Old Persian kara "host, people, army;" Greek koiranos "ruler, leader, commander"). Weakened sense of "worry, goad, harass" is from c.1400. Related: Harried; harrying.
masc. proper name, a familiar form of Henry. Weekley takes the overwhelming number of Harris and Harrison surnames as evidence that "Harry," not "Henry," was the Middle English pronunciation of Henry. Also cf. Harriet, English equivalent of French Henriette, fem. diminutive of Henri. Nautical slang Harriet Lane "preserved meat" (1896) refers to a famous murder victim whose killer allegedly chopped up her body.
big harry, every tom* dick* and harry