These are a bit cheesy and predictable, and you don’t know the sexes, but you could name them after famous trios…
Pavarotti, [name]Domingo[/name], and Carreras? (The Three Tenors)
[name]Melchior[/name], [name]Gaspar[/name], and [name]Balthazar[/name]? (The Wise Men…to some)
Athos, [name]Porthos[/name], and [name]Aramis[/name] (The Three Musketeers… I imagine there are a lot of kitten siblings with these names, though)
I can’t think of any others except for [name]Hermione[/name], [name]Harry[/name], and [name]Ron[/name] from [name]Harry[/name] [name]Potter[/name]. Maybe this wasn’t such a good idea, after all.
Other suggestions:
Kuro means black in Japanese… for the little black one.
Shima can be a word for stripe in Japanese… for the striped one.
Shiro means white in Japanese… for the one with white legs… or [name]Mura[/name] which can mean spots/lack of uniformity in Japanese.
Names meaning black or having to do with the color:
Braith (unisex)
[name]Nigel[/name]
[name]Dudley[/name]
[name]Blake[/name] (can mean black or white)
[name]Sable[/name]
[name]Melanie[/name]
[name]Grey[/name] color names:
[name]Lloyd[/name]
[name]Griselda[/name]/[name]Zelda[/name]
[name]Silver[/name]
[name]Gina[/name]/[name]Gin[/name] (Japanesed- pronounced ‘g’ as in “guy” and the ‘in’ like “een”)
White names:
[name]Gwyn[/name] (and it’s variants/longer forms)
[name]Albert[/name]/[name]Albus[/name]
[name]Finn[/name]
[name]Fiona[/name]
[name]Gavin[/name]
[name]Blanche[/name]
[name]Winter[/name]