Mix 'n Match (Boy & Girl): Which Names Go Best Together?

I have a short list of boy names that I really love and I’m trying to narrow my list of girl names to match in length. I tried asking which names people liked most and which they like least, which did help a lot. However, now I’m wonder which of the girl names do you think go best with my list of boy names? Try to list only 6 girl names. Thanks!!

Boy Names:
[name_m]Alexander[/name_m]
[name_u]Blake[/name_u]
[name_m]Felix[/name_m]
[name_m]Leo[/name_m]
[name_m]Nathaniel[/name_m]
[name_m]Oliver[/name_m]

Girl Names:
[name_f]Adelaide[/name_f]
[name_f]Autumn[/name_f]
[name_f]Charlotte[/name_f]
[name_f]Claudia[/name_f]
[name_f]Cosima[/name_f]
[name_f]Delphine[/name_f]
[name_f]Esme[/name_f]
[name_f]Freya[/name_f]
[name_f]Iliana[/name_f]
[name_f]Johanna[/name_f]
[name_f]Lana[/name_f]
[name_f]Lorelei[/name_f]
[name_f]Lucy[/name_f]
[name_f]Mara[/name_f]
[name_f]Marie[/name_f]
[name_f]Natalia[/name_f]
[name_u]Piper[/name_u]
[name_f]Tabitha[/name_f]
[name_f]Thea[/name_f]
[name_f]Veronica[/name_f]
[name_f]Violet[/name_f]

P.S. If there are any names you’re unsure of how to pronounce, let me know. And if there is a name you think sounds really great (with [name_m]Alexander[/name_m], [name_u]Blake[/name_u], [name_m]Felix[/name_m], [name_m]Leo[/name_m], [name_m]Nathaniel[/name_m], [name_m]Oliver[/name_m]) but isn’t on here, feel free to suggest it. I realize it’s counterproductive to my goal, but I don’t want to completely narrow my horizon too soon and miss out on a fantastic name.

[name_m]Alexander[/name_m] and [name_f]Veronica[/name_f]
[name_u]Blake[/name_u] and [name_f]Iliana[/name_f]
[name_m]Felix[/name_m] and [name_f]Lucy[/name_f]
[name_m]Leo[/name_m] and [name_f]Cosima[/name_f]
[name_m]Nathaniel[/name_m] and [name_f]Charlotte[/name_f]
[name_m]Oliver[/name_m] and [name_f]Freya[/name_f]

[name_m]Alexander[/name_m] and [name_f]Johanna[/name_f]
[name_u]Blake[/name_u] and [name_f]Lucy[/name_f]
[name_m]Felix[/name_m] and [name_f]Thea[/name_f]
[name_m]Nathaniel[/name_m] and [name_f]Adelaide[/name_f]
[name_m]Leo[/name_m] and [name_f]Charlotte[/name_f]
[name_m]Oliver[/name_m] and [name_f]Violet[/name_f]