I love [name_f]Gemma[/name_f]! Some sibling ideas:
[name_f]Allegra[/name_f]
[name_f]Lavinia[/name_f]
[name_f]Lucretia[/name_f] / [name_f]Lucrezia[/name_f]
[name_f]Fiona[/name_f]
[name_f]Lucia[/name_f]
[name_u]Arthur[/name_u]
[name_m]Irving[/name_m]
[name_m]Edmund[/name_m]
[name_m]Anthony[/name_m]