There are multiple origins and translations for the name Tatyana:
1. East Slavic (Russian Татьяна) mega popular name, which was derived from the Slavic word tata, cognate with ancient Greek word (τέττᾰ) [tetta], cognate with Latin atta interpretation - "daddy; fatherly" means - "father's daughter". Or derived from Slavic verb таить [tait`] means - "secretive, cagey".
2. Feminine equivalent of the Latin male name Titus means - "heroic, titanic", see Tatiana.
3. Comes from the Latin name Tatius the name of ancient mystical king of the Sabines.