I love the name
Sylvia. It's #4 on DH's and my list of names for future daughters, so it probably won't get used in our family, but I love it a lot. My favorite combo is
Sylvia Margaret. I think
Sylvia works well in combination with other old-fashioned names that are a little more down-to earth (
Katherine,
Caroline,
Rachel,
Helen,
Penelope)
Siblings for
Sylvia would have to be other classic or old-fashioned names. If I had a daughter named
Sylvia, her siblings might be named
Margaret "
Maggie",
Elspeth,
Julia,
Ezra,
Asher, or
Jonas.