I feel like something short and/or European (reminiscent of [name_f]Esme[/name_f], [name_f]Lyra[/name_f], and [name_f]Clio[/name_f] in spirit) might be the way to go? 
[name_f]Maris[/name_f] [name_f]Valentina[/name_f]
[name_f]Romy[/name_f] [name_f]Valentina[/name_f] or [name_f]Romée[/name_f] [name_f]Valentina[/name_f]
[name_f]Ines[/name_f] [name_f]Valentina[/name_f]
[name_f]Katri[/name_f] [name_f]Valentina[/name_f]
[name_f]Malou[/name_f] [name_f]Valentina[/name_f]
[name_f]Alice[/name_f] [name_f]Valentina[/name_f]
[name_f]Astrid[/name_f] [name_f]Valentina[/name_f]
[name_f]Lumi[/name_f] [name_f]Valentina[/name_f]
[name_f]Cecily[/name_f] [name_f]Valentina[/name_f]
[name_f]Anaïs[/name_f] [name_f]Valentina[/name_f]
[name_f]Eugénie[/name_f] [name_f]Valentina[/name_f]
[name_f]Margot[/name_f] [name_f]Valentina[/name_f]
[name_f]Anya[/name_f] [name_f]Valentina[/name_f]
[name_f]Juno[/name_f] [name_f]Valentina[/name_f]
[name_f]Ysanne[/name_f] [name_f]Valentina[/name_f]