I really think of a dog as well, but if u love it go for it!
I love [name]Rex[/name], if baby had been a boy middle would have been [name]Rex[/name].
I’ve never met a dog named [name]Rex[/name] or know anyone who has one but I know two men named [name]Rex[/name], I see no problem with it.
It doesn’t feel vintage to me, and while I don’t really think of it as a dog’s name, I don’t feel like I take it entirely seriously. Maybe it’s the dinosaur association?
I really love [name]Rex[/name]. It’s not vintage sounding to me, if that’s what you’re going for, and I know it sounds like a pets name, but I would really love to see it on a little boy.