Beth is quite nice with
Sarah and it could even be used together like a double name to differentiate her from other Sarahs (since it's such a common name)... I personally like Nozomi with
Sarah, but am guessing the "classical" names you're looking for are European and not Japanese...
Abigail Sarah is kind of pretty, but doesn't work so well the other way because of the -ah a- thing... though some still do that with
Sarah Anne (which I still think seems a little awkward)...
Charlotte is somewhat classical, though how well it fits with
Sarah would be a matter of opinion...
Joanne Camille ChantalCollette
FrancineGiselleJeannetteLisetteMichelleNicolePascalePascalinePaulineRenee (
Renae)
BerniceBeverlyCadenceCharlene (
Charleen)
ColleenDawnJeanJasmineCatherineKimberlyLynneMae (
May)
Natalie