Comment on Tatya by Livadialilacs

I thought that Tatya was made up by Sarah Miller, or at least picked from obscurity, because there was already a Tanya in The Lost Crown. It was one of the few purposeful historical inaccuracies she included, as to not confuse her readers. I don't believe Tatiana was called Tatya very often. I might be wrong, though (I don't speak much Russian    !)