Silvester is OK, I don't like
Silver as a nn. That's a little too out-there for me.
Silvester still reminds me of the cartoon cat. Plus, I just hear "vest," and though I enjoy wearing vests, it's just not really that pleasing to my ears
Nicodemus is nice. I have a cousin named this (they called him
Nicky as a little kid and
Nico when he got older). It's a little much for me, but still kinda cool.
Peregrine is AWESOME!!! I heard it once as a girls' name in a movie and I thought it was lovely. While it sounds a little anemic for a boy, I think it sounds strong but not over the top for a girl.