Thanks for all your help! After talking with DH, we've got a bit of a list (actually, this is DH's list - but I kind of gave up cause I'm too fussy, lol).

So, here are the names on DH's list. Tell me which ones you like - keeping in mind we'd like it to go nicely with Oliver, and also our surname ends in 'y', so I'm not too keen on names with an 'ee' sound at the end.

Archer
Charlie
Felix
Jasper
Lucas
Riley
Xavier