Hi my name is Tania, I was told by a Russian friend a while ago that even though that is my name on my birth certificate, I could still technically go by Tatiana because Tania is a form of it...is that true? I have been using the name and the nickname Tia as my stage name for a while now. I know Tania is a nickname of Tatiana, but can it be used the other way around? TIA.