I love [name_f]Petra[/name_f]! Part traditional, and part edgy.
[name_f][/name_f]Here are some other ideas off the top of my head:
[name_f][/name_f][name_m]Arlo[/name_m]
[name_f][/name_f][name_m]Theo[/name_m]
[name_f][/name_f][name_f]Daphne[/name_f]
[name_f][/name_f][name_f]Dalia[/name_f]
[name_f][/name_f][name_m]Cyrus[/name_m]
[name_f][/name_f][name_m]Orion[/name_m]
[name_f][/name_f][name_m]Amir[/name_m]