Gee

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mid 19th century: perhaps an abbreviation of Jesus.

wiktionary

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A shortening of Jesus, perhaps as in the oath by Jesus.

Unknown.

From Middle English, from Old English ge, from Latin ge(the name of the letter G).

Unknown. Possibly from gowl(“vagina, vulva”), a slang term in Ireland. Compare Irish gabhal(“fork, crotch”).

Unknown.

etymonline

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gee (interj.)

exclamation of surprise, 1895, probably euphemistic for Jesus. Form gee whiz is attested from 1871; gee whillikens (1851) seems to be the oldest form. As a command to a horse to go, 1620s, Scottish. It had a particular sense as a teamster's command: "go to the right (or off) side of the driver." Extended form gee-up is from 1733, the second element said by OED to be hup.