I like Zeke. Or however you decide to spell it. I worked with a super cool, incredibly sweet PT dude named Zeke.
I'm not a fan of Logan at all, if my opinion even matters. It's fairly popular here as well. I just don't like it.
I don't mind Seeker, don't know anything about the Harry Potter connection to it.
Emmet, I dunno. It's ok. I know I'd end up calling him Emma or Emmie that's just me. I'd love a boy dog with the nickname Emma, actually.
How about Doc? Or Leo.
I think they look so wise & grandpa-ish as adults, regal & scruffy all at the same time.