Thomasin - It's alright but I prefer
Thomas as a boy over Thomasin.
Cecily - It's pretty and elegant for me. I prefer
Cecilia too.
Amice - It reminds me of
Alice and
Amity but unfortunately, it sounds like "a mice".
Felice - It's Italian version of
Felix but it reminds me of "feline", which is refers to the cats.