[Opinions] Re: Thomasin, Cecily and Amice, Felice
Thomas Hardy uses Thomasina in, I think, Return of the Native. She's usually called Tamsin; Thomasina for when she's done something wrong!
I agree that Amice is too close to Alice for comfort. I'd far rather use Alice.
Felice, I've never encountered, though I did meet a Felicia once. I much prefer Felicity.
My father was, probably, one of the last of the Cecils. I'd have used Cecily for a daughter if I'd had enough daughters for all the names I'd have loved to use; I wouldn't use Cecil for a son, though: too dated.