I really like
Blythe and would love to encounter it more often. I don't find it dated.
Blythe and
Matilda would work as sister names, but the names each give off a different vibe.
Blythe is more free-spirited sounding, while
Matilda is more grounded and sturdy.
Clover is a bit too hippie for me, but I don't mind the sound of it.