Names like Vesper???

So I’m writing a book and long story short, i have one character named [name_u]Vesper[/name_u] and she has an older brother (around 17 or 18) and an older sister (20 odd) but i’m not sure what to name them?? Maybe something with the same amount of syllables as [name_u]Vesper[/name_u]? I think the surname will be [name_m]Smith[/name_m] or something of the sorts.
Thank you xx

[name_f]Vanessa[/name_f], [name_m]Vaughn[/name_m], and [name_u]Vesper[/name_u]
[name_f]Nova[/name_f], [name_u]Sky[/name_u], and [name_u]Vesper[/name_u]
[name_f]Venus[/name_f], [name_u]Orion[/name_u], and [name_u]Vesper[/name_u]
[name_f]Thea[/name_f], [name_u]Nico[/name_u], and [name_u]Vesper[/name_u]
[name_f]Alba[/name_f], [name_m]Bastian[/name_m], and [name_u]Vesper[/name_u]
[name_f]Serena[/name_f], [name_m]Roman[/name_m], and [name_u]Vesper[/name_u]
[name_f]Alaska[/name_f], [name_m]Soren[/name_m], and [name_u]Vesper[/name_u]
[name_f]Juno[/name_f], [name_m]Atlas[/name_m], and [name_u]Vesper[/name_u]
[name_f]Lux[/name_f], [name_m]Christian[/name_m], and [name_u]Vesper[/name_u]
[name_f]Sabina[/name_f], [name_m]Marcus[/name_m], and [name_u]Vesper[/name_u]

I tried to go with different themes to find names that would match [name_u]Vesper[/name_u]'s style, but I mostly stuck with [name_m]Roman[/name_m] and Latin names.

Is there a style or theme you’re looking for with the siblings’ names? What would have been the parents’ name inspiration?