I love [name_u]Chapel[/name_u] and really like [name_u]Collins[/name_u] too. I like the ABC theme, so sticking with that and maiden-ish names, and I’m sure some repeats, here goes:
[name_u]Conley[/name_u]
[name_u]Clancy[/name_u]
[name_u]Channing[/name_u]
[name_u]Crosby[/name_u]
[name_u]Calloway[/name_u]
[name_u]Corbin[/name_u]
[name_u]Carrington[/name_u] (knew a boy named this, it was a family name)
[name_f]Camry[/name_f]
[name_f]Cambria[/name_f]
[name_u]Cameron[/name_u]
[name_u]Campbell[/name_u]
[name_u]Chandler[/name_u] (know a mid-20s girl with this name and she has always loved her name!)
[name_u]Clarke[/name_u] (know a little girl with this name now and it’s oh so perfect)
We have very different taste so not sure if anything I suggest will appeal, but I recently came across Crina, it’s a Romanian name meaning [name_f]Lily[/name_f] which I thought was pretty but may be too feminine for you. [name_u]Caro[/name_u] is good and less pretty / frilly, and I think it sounds good with your children’s names.