It’s not a dumb question. It was intended to be “you and me” though I tend to get lazy and just call it “you-me”. I didn’t anticipate people talking about it in non-text form when I created it long before anyone ever paid attention to me. When I started getting asked to speak on panels at conventions about my comics, that’s when I suddenly realized “crap, I need to settle on a way to say this out loud.” If I was making it today, I’d probably have picked a slightly different name.
This is probably a dumb question but how do you pronounce "Yu+Me"? Is it "yume" like the Japanese word it puns on, or "you and me" or "you plus me" or what?