In summary, "jeez" and "geez" are both informal exclamations used to express surprise, frustration, or emphasis. They are both considered mild swear words or interjections, and they are both considered informal, and should be avoided in formal writing or speech.

To make the whole thing more confusing la prononciation française of G sounds like la prononciation anglaise of J. Bref (in short), the confusing pairs end up sounding like this: French: G – Jay, J – Jee English: G – Gee), J – Jay