Because you like some long and frilly names as well as [name_u]Romy[/name_u], I’m recommending [name_u]Romilly[/name_u], [name_f]Romana[/name_f] and [name_f]Romina[/name_f] incase you like them in their own right, but also so that [name_u]Romy[/name_u] could be a nn. (I live in the UK, [name_u]Romy[/name_u] is 100% a full first name to me, I’m not suggesting it needs ‘a longer form’. I just love it when you get to use two names!)
Some others inspired by your list:
[name_f]Nia[/name_f], [name_u]Noa[/name_u], [name_f]Nara[/name_f], [name_f]Nyla[/name_f], [name_f]Myla[/name_f], [name_f]Nerys[/name_f], Nolvia, [name_f]Nolwenn[/name_f], [name_f]Antonina[/name_f], [name_f]Adrienna[/name_f], [name_u]Nova[/name_u], [name_f]Novalie[/name_f], [name_f]Noella[/name_f], [name_f]Noelia[/name_f], [name_f]Neve[/name_f], [name_f]Nieva[/name_f]
[name_f]Georgette[/name_f] / [name_f]Georgetta[/name_f], [name_f]Genavie[/name_f], [name_f]Vita[/name_f], [name_f]Lovisa[/name_f]
[name_f]Alsephina[/name_f]
[name_f]Eirlys[/name_f]
[name_f]Ilanys[/name_f]
[name_f]Inessa[/name_f]
[name_f]Adelia[/name_f]
[name_f]Perdita[/name_f], [name_f]Pandora[/name_f], [name_f]Isadora[/name_f], [name_f]Pomeline[/name_f], [name_f]Paloma[/name_f]
[name_f]Ravenna[/name_f], [name_f]Rosina[/name_f]