I don't care for
Sunny. It could work as a nickname for
Sonja, perhaps spelled as
Sonny, but I don't think nicknames should revolve around formal names. But, I don't care for
Sunny /
Sonny or
Sonja.
I don't care for
Klaus. I think of
Santa Claus /
Klaus, a
clause in a contract, and
cold slaw (for some reason).
Violet is OK. I used to like it, but it's not my style anymore.