Sabrina as the Latin name of the river Severn is very lovely, as is the river for most of its length. I associate it with 16th or 17th century theatre, not sure why: a
Ben Jonson masque perhaps? Too idle to find out. But that's also good.
Serena is a Williams sister and undoubtedly a remarkable athlete, but watching her is boring and she has an unfortunate body shape. I was at school with a very different
Serena who was quite good at sport (not tennis) and generally cheerful and pleasant. So it gives me mixed messages. I'd rather meet a
Sabrina than a
Serena, and I wouldn't use either.