I think you’re on the right track!
It depends if you want to double down on the “Southern” style: [name_f]Caroline[/name_f], [name_f]Abigail[/name_f] or [name_f]Penelope[/name_f] - and [name_f]Adelaide[/name_f] and [name_f]Evelyn[/name_f].
Make it a bit more [name_m]Brit[/name_m] / [name_f]English[/name_f] sounding: [name_f]Harriet[/name_f], [name_f]Beatrice[/name_f], [name_f]Edith[/name_f], [name_f]Helen[/name_f], [name_f]Imogen[/name_f], [name_f]Romilly[/name_f], [name_f]Philippa[/name_f] (Pippa), [name_f]Daphne[/name_f], [name_f]Florence[/name_f], [name_f]Francesca[/name_f] (get this is distinctly Italian) and [name_f]Isobel[/name_f].
I feel like [name_f]Louisa[/name_f] and [name_f]Emily[/name_f] could be from many places and match, as could [name_f]Felicity[/name_f], [name_f]Mary[/name_f], [name_f]Violet[/name_f], [name_f]Sophie[/name_f], [name_f]Mabel[/name_f], [name_f]Annabel[/name_f], [name_f]Charlotte[/name_f], and [name_f]Constance[/name_f].
[name_m]William[/name_m] and [name_m]Charles[/name_m] are very regal - so with the Kings & Princes [name_m]Georges[/name_m], you might get comments but they do go well together as does [name_m]Oliver[/name_m], [name_m]Henry[/name_m], [name_m]Harry[/name_m], [name_m]Albert[/name_m], [name_m]Philip[/name_m], [name_m]Thomas[/name_m] and [name_m]Edward[/name_m] for other regal / noble names.
Otherwise maybe a little more flamboyant and playful: [name_m]Sebastian[/name_m], [name_m]Rafferty[/name_m], [name_m]Curtis[/name_m], [name_m]August[/name_m], [name_m]Hugh[/name_m], [name_m]Leo[/name_m], [name_f]Darcy[/name_f], [name_m]Alasdair[/name_m], [name_m]Otis[/name_m], [name_m]Westley[/name_m], [name_m]Rupert[/name_m], [name_m]Felix[/name_m], and [name_m]Ambrose[/name_m].
[name_f]Hope[/name_f] this helps!