[name_f]My[/name_f] preferences for a fifth sibling would be:
[name_f][/name_f][name_f]Ines[/name_f]
[name_f][/name_f][name_f]Cleo[/name_f]
[name_f][/name_f][name_f]Vita[/name_f]
[name_f][/name_f][name_f]Beatrix[/name_f]
[name_f][/name_f][name_f]Xanthe[/name_f]
[name_f]Ines[/name_f], [name_f]Cleo[/name_f] and [name_f]Vita[/name_f] all hit the right notes as chic and tailored choices. [name_f]Ines[/name_f] gets you a different ending sound, [name_f]Cleo[/name_f] repeats but is more lively and fun, [name_f]Vita[/name_f] looks a little similar to [name_m]Kit[/name_m] visually and is less familiar so drops down to third.
[name_f][/name_f][name_f]Beatrix[/name_f] and [name_f]Xanthe[/name_f] feel like style departures, although not significant ones. [name_f]Juno[/name_f] and [name_f]Xanthe[/name_f] work nicely but [name_f]Xanthe[/name_f] feels a lot bolder than any of the siblings.
[name_f][/name_f]I would add [name_f]Hebe[/name_f].