[name_m]Oswin[/name_m] and [name_m]Osric[/name_m] both give medieval monk vibes (complimentary). Adorably nerdy on a baby, unexpected, perhaps a little harder to wear as a teen/adult? Would definitely get Ozzy/Ozzie/Oz.
[name_f][/name_f][name_m]Selwyn[/name_m] [name_f][/name_f]- to me this sort of belongs with [name_m]Sidney[/name_m], [name_m]Valentine[/name_m], [name_f]Evelyn[/name_f] (eev-lin), [name_m]Clarence[/name_m] etc [name_f][/name_f]- they’re dapper chaps from the 1920s. I don’t personally have the ‘sell/win’ issue.
[name_f][/name_f][name_m]Crosley[/name_m] [name_f][/name_f]- I knew people whose last name was Crossley so this spelling reads as ‘crows-lee’ to me. I don’t think I love it either way.
[name_f][/name_f][name_m]Oswald[/name_m] [name_f][/name_f]- afraid I too think immediately of [name_m]Lee[/name_m] [name_m]Harvey[/name_m], and of [name_m]Oswald[/name_m] [name_f]Mosley[/name_f] who was a famous fascist. Not particularly usable imho.
[name_f][/name_f]Keene/Keane [name_f][/name_f]- hmm it is a bit ‘keen’ and also makes me think of the band. Not bad?
[name_f][/name_f][name_m]Anselm[/name_m] [name_f][/name_f]- I like this, understated and unexpected. Might cop Annie/Ani as a nickname, not sure how you feel about that.
[name_f][/name_f][name_m]Eleazer[/name_m] [name_f][/name_f]- great meaning but I’m afraid I just see ‘sleaze’ 
[name_m]Eben[/name_m] [name_f][/name_f]- I like it but yes, would probably get mixed with [name_m]Evan[/name_m]. It also took some persuading to make my phone write [name_m]Eben[/name_m] and not [name_m]Even[/name_m].