I’m loving both of your ideas! [name_m]Magnus[/name_m], [name_m]Bastian[/name_m], [name_f]Mira[/name_f], [name_f]Anika[/name_f], [name_m]Marko[/name_m] ‘Mars’ , [name_m]Aksel[/name_m], [name_m]Apolo[/name_m], [name_f]Zora[/name_f], and [name_f]Kaja[/name_f] are brilliant.
I like [name_f]Nika[/name_f] for them too 
A couple more ideas:
[name_f]Antonija[/name_f] / [name_f]Antonia[/name_f]
[name_f]Zorica[/name_f]
Taisia / Tasija
[name_f]Viola[/name_f]
[name_f]Sanja[/name_f]
[name_f]Mirna[/name_f]
[name_m]Zoran[/name_m]
Anto
[name_m]Evander[/name_m]
[name_m]Silvan[/name_m]