Oh, I thought you really were asking about Silivia (
Silvia +
Olivia?)!
I love
Sylvia. My grandfather's sister was named
Sylvia-- she died of TB or something when she was a teenager, so I always thought it would be nice to name someone after her. I prefer this spelling, but
Silvia is nice, too.
I'd use maybe
Sylvia FrancesSylvia EsmeSylvia EstherSylvia Hester