A Few Questions on My List

I’ve been playing around with my lists and came up with a few combos I’m unsure about.

Boys:
[name_m]Levi[/name_m] [name_m]Rune[/name_m]/[name_m]Fyodor[/name_m] (Which middle name do you like better?)
[name_m]Stellan[/name_m] Anxo (Ahn-sho)
[name_u]Casey[/name_u] [name_m]Arvid[/name_m] (Too soft?)
[name_m]Henry[/name_m] [name_m]Arkady[/name_m]/[name_m]Conall[/name_m] “[name_m]Heiko[/name_m]” (What would you think of [name_m]Heiko[/name_m]? Its a [name_m]German[/name_m] pet name for [name_m]Heinrich[/name_m] but I’ve had people think it’s Japanese because of the -ko ending.)

Girls:
[name_f]Charlotte[/name_f] [name_f]Lenore[/name_f] (too many "l"s?)
[name_f]Dahlia[/name_f]/[name_f]Delilah[/name_f] [name_f]Marceline[/name_f] (which first name do you like better?)
[name_f]Sylvia[/name_f] [name_u]Echo[/name_u]/[name_f]Lenore[/name_f]/[name_f]Bethan[/name_f] (I love [name_f]Sylvia[/name_f] but cannot find a middle name I like with it.)
[name_f]Aisling[/name_f] [name_f]Calliope[/name_f] (Does [name_f]Aisling[/name_f] work in the US? She sounds like [name_f]Ashlynn[/name_f], to my understanding, but would it cause too many problems?)

Thanks in advance!