Is the expression "Gee" short for "Jesus"?

?

Not really sure, but my parents assumed “gee” and “geez” to be short for Jesus.

We were allowed to say neither when I was growing up.

Then again, we also weren’t allowed to say “I hate you”, “shut up” or use “butt”. Believe it or not, it actually lasted until I was in about 4th grade.

I believe so.
The full “Gee-wizz” is too.

In intent and function, as a euphamism for a proscribed cuss-word, but with the same vocal shape.
Compare (English English)

blooming:bloody
heck:hell
darn:damn
etc etc. There must be an online dictionary somewhere nearby…

“Gee” as short for Jesus, Jerusalem, Jehoshaphat, is cited in print from 1851. And that particular cite was a euphemism for Jesus.

“Jeez” can be found in 1830.

It is generally assumed that “gee” and “gee whiz” derive from “Jesus”. As I believe Cecil once noted, “Judas Priest” is apparently a euphemism for “Jesus Christ”. During an angry declaration in The Great Dictator, Charlie Chaplin says “Cheese 'n Crackers”, a now rarely-used euphemism for “Jesus Christ”. The rarely-heard “for cry-eye” (I used to hear that one as a kid in the 60s) apparently comes from “Christ”. And, of course, “gosh” and the “goodness” in “for goodness sakes” seems to come from “God”.

It is generally assumed that “gee” and “gee whiz” derive from “Jesus”. As I believe Cecil once noted, “Judas Priest” is apparently a euphemism for “Jesus Christ”. During an angry declaration in The Great Dictator, Charlie Chaplin says “Cheese 'n Crackers”, a now rarely-used euphemism for “Jesus Christ”. The rarely-heard “for cry-eye” (I used to hear that one as a kid in the 60s) apparently comes from “Christ”. And, of course, “gosh” and the “goodness” in “for goodness sakes” seems to come from “God”. “Darn”, “dang”, and the old-fashioned “dag-nabbit” all apparently relate to “damn”.

This process applies not only to profanity, but to obscenity besides: hence “fudge” and “sheesh”.

From www.m-w.com

Main Entry: gee
Function: interjection
Etymology: euphemism for Jesus
Date: 1884
– used as an introductory expletive or to express surprise or enthusiasm