I’m thinking…
[name_f]Ilaria[/name_f] and [name_f]Ginevra[/name_f] (possibly too blatantly Italian for someone with no Italian heritage)
[name_f]Mabli[/name_f] and [name_f]Carys[/name_f] (I go between loving and feeling the matching meanings are a bit twee)
[name_f]Pearl[/name_f] and [name_f]Opal[/name_f] (too matchy – as words and sound-wise)
[name_f]Sarai[/name_f] and [name_f]Zadie[/name_f] (same name)