For girls, I think either [name_f]Isabella[/name_f] [name_f]Julianne[/name_f] or [name_f]Francesca[/name_f] [name_f]Lucianne[/name_f] would be my choices with the girls’ names. These two combinations match in elegance but are still distinct enough IMO.
[name_f][/name_f]For boys, here are a few combos that match the distinguished yet romantic character of the girls IMO:
[name_f][/name_f][name_m]Raphael[/name_m] nn [name_m]Rafe[/name_m] [name_m]Anthony[/name_m] (a subtle tie to the “-anne” ending of the girls’ middles)
[name_f][/name_f][name_m]Whittaker[/name_m] [name_m]Lawrence[/name_m]
[name_f][/name_f][name_m]Sebastian[/name_m] [name_m]Alexander[/name_m]
[name_f][/name_f][name_m]Alastair[/name_m] [name_m]Etienne[/name_m] (double n as a subtle tie to the girls’ middles)
[name_f][/name_f][name_m]Cassian[/name_m] [name_m]Henry[/name_m]
[name_f][/name_f][name_m]Julian[/name_m] [name_m]Carlisle[/name_m]
[name_f][/name_f][name_m]Devereaux[/name_m] [name_m]James[/name_m]
[name_f][/name_f][name_m]Fitzwilliam[/name_m] [name_m]Lucien[/name_m]
[name_f][/name_f][name_m]Tristan[/name_m] [name_f]Darcy[/name_f]
[name_f][/name_f][name_m]Elian[/name_m] [name_m]Maximus[/name_m]
[name_f][/name_f][name_m]Octavian[/name_m] [name_m]Mark[/name_m]
[name_f][/name_f][name_m]Meriadoc[/name_m] [name_m]Jameson[/name_m]
[name_f][/name_f]Hopefully these help! 