I don't know if I ever loved
Josephine, but I have always liked
Joseph,
Serafina, and three syllable names.
I think
Josephine is like a sepia photograph. It's muted and maybe artful. It's understated, not without dignity.
Probably wouldn't use a NN, but if I did,
Jo.
Sibling could be:
Violet,
Florence,
Isabel,
Julian,
Emanuel,
Christopher.