There is a novel called "Тихий Дон" where the author describes a cossack who brought himself a Turkish woman who became his wife. And thus his kids had some Turkish blood. I do not mean that your ancestors were Turks, it is just an example of how traces of various ethnicities can be mixed in people despite their having a specific national surname. Also, FYI in pre-revolution Russia there was no official concept of 'ethnicity', only of religous affiliation. Hope this helps.