Found Bun Outside – Name Suggestions?

I've had him since Christmas. First named him Gabriel/Gabe, then changed it Max (like max&ruby)

But I usually refer to him as Bun Buns and I can't help it, the other names didn't stick. But I don't want Bun Buns to be his actual name.

Also – how's the setup? I had a tall x pen around it but he would always hop out and lock himself out 😂 so I took the x pen out. But he still hardly uses his area and I can't understand why that is.