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Так ты ещё и русский неплохо знаешь! Добро пожаловать на MasterRussian! :-D

Bakhvalov(a) sounds completely Russian. Moreover, I don't think there are feminine Russian surnames that end on "-ava". Only "-ova", "-eva" (if we are talking about names that end on "-v-"). So...

What if it's one of the names from the Georgian region? E.g. Zurab Sotkilava.
http://ru.wikipedia.org/wiki/%D0%93%D1% ... 0%B2%D0%B0