What goes with Caspar?

If I told you that I had a son named [name]Caspar[/name], what names would you suggest for a brother or sister?

I love the name [name]Caspar[/name]…[name]How[/name] about:

[name]Sebastian[/name]
[name]Julian[/name]
[name]August[/name]
[name]Axel[/name]
[name]Soren[/name]
[name]Nico[/name]
[name]Felix[/name]
[name]Dominic[/name]
[name]Elias[/name]
[name]Silas[/name]
[name]Luca[/name]
[name]Bennett[/name]
[name]Theo[/name]
[name]Griffin[/name]

[name]Fiona[/name]
[name]Eloise[/name]
[name]Amalia[/name]
[name]Rosalie[/name]
[name]Eva[/name]
[name]Stella[/name]
[name]Amelie[/name]
[name]Vivian[/name]
[name]Elodie[/name]