[thomassmith65]

Gemini's inspiration was the "gopher" protocol from the early 1990s. Gopher was a text-only precursor to the web - plain text with highlighted clickable text links. If you've ever used an ancient library computer (green and black display), their UI was essentially the same as gopher.

[fragmede]

it's not their fault Google came along and used that name, but they did, so here we are.

[krapp]

To be fair, names based on Greek and Roman mythology were overplayed back when NASA was using them. Calling anything "Gemini" is about as uncreative as one can get.