Because "gemini" just means "twins" (actually "born together") in Latin same as "didymoi" in Greek, and there were lots of twins around (like Thomas Didymus, a/k/a Doubting Thomas).
Also, Romans didn't speak English, but Englishmen spoke Latin, at least all the educated ones. So I think the derivation of "Jiminy" from Jesu Domine is more likely.
My grandfather used to say "Jiminy Christmas!" which confirms that derivation . . . it would be "Jesu Domine, Christe!"
He also always called a Coca-cola a "dope". He was born in 1890.
The older I get the more I realize how little know. Thanks. One of these mornings at the truckstop I may get to say, “By Castor and Pollux! This coffee’s cold.”
That's when it contained REAL dope!