[name_m]Hi[/name_m] there.
Ooh, [name_f]Willemina[/name_f] is so lovely! I think that [name_u]Miles[/name_u] or [name_f]Vivienne[/name_f] would be great for her sibling. I’m partial to just [name_u]Milo[/name_u] though. [name_u]Miles[/name_u] is a lot more popular anyway, & [name_u]Milo[/name_u] feels like it’s a name on its own enough to not be a nn for [name_u]Miles[/name_u]. I like the nn [name_f]Vivie[/name_f] (said Vee-vee) for [name_f]Vivienne[/name_f].
A few other ideas that you may like: (sorry for any repeats!)
Boys-
[name_m]Adrian[/name_m]
[name_u]August[/name_u]
[name_m]Augustus[/name_m]
[name_m]Aurelius[/name_m]
[name_m]Albert[/name_m]
[name_u]Alden[/name_u]
[name_m]Aubin[/name_m]
[name_m]Bernard[/name_m]
[name_m]Barnaby[/name_m]
[name_m]Barnabas[/name_m]
[name_m]Bastian[/name_m]
[name_u]Basil[/name_u]
[name_u]Bennett[/name_u]
[name_m]Charles[/name_m]
[name_m]Caspian[/name_m]
[name_m]Caspar[/name_m]
[name_m]Desmond[/name_m]
[name_m]Dashiell[/name_m]
[name_m]Edgar[/name_m]
[name_m]Eben[/name_m]
Esben
[name_m]Frederic[/name_m]
[name_u]George[/name_u]
[name_u]Gabriel[/name_u]
[name_u]Holden[/name_u]
[name_m]Isaac[/name_m]
[name_m]Ivan[/name_m]
[name_m]Julius[/name_m]
[name_m]Jerome[/name_m]
[name_m]Jeremiah[/name_m]
[name_m]Louis[/name_m]
[name_m]Linus[/name_m]
[name_m]Malcolm[/name_m]
[name_m]Maximilian[/name_m]
[name_m]Oscar[/name_m]
[name_m]Peter[/name_m]
[name_u]Peregrine[/name_u]
[name_m]Rafferty[/name_m]
[name_u]Tristan[/name_u]
Girls-
[name_f]Adelaide[/name_f]
[name_f]Beatrice[/name_f]
[name_f]Clementine[/name_f]
[name_f]Eloise[/name_f]
[name_f]Frances[/name_f]
[name_f]Isolde[/name_f]
[name_f]Josephine[/name_f]
[name_u]Louise[/name_u]
[name_f]Lucille[/name_f]
[name_f]Margaret[/name_f]
[name_f]Olive[/name_f]
[name_f]Philippa[/name_f]
[name_f]Rosalie[/name_f]
[name_f]Sylvia[/name_f]
[name_f]Theodora[/name_f]
[name_f]Hope[/name_f] this helps.