[name_f]Sofie[/name_f] would be my pick!
[name_f][/name_f][name_m]Other[/name_m] ideas:
[name_f][/name_f][name_f]Effie[/name_f]
[name_f][/name_f][name_f]Sera[/name_f]
[name_f][/name_f][name_m]Sefi[/name_m] / [name_m]Safi[/name_m]
[name_f][/name_f][name_f]Fifi[/name_f]
[name_f][/name_f][name_f]Fina[/name_f]
[name_f][/name_f][name_f]Fia[/name_f]
[name_f][/name_f][name_f]Sora[/name_f]
[name_f][/name_f][name_f]Sea[/name_f]
[name_f][/name_f][name_f]Sia[/name_f]
[name_f][/name_f][name_f]Elfie[/name_f]