There are multiple origins and meanings for the name Tatiana:
1. The female equivalent of the Latin male given name Titus meaning - "heroic, titanic"
2. Russian (East Slavic) first name (Татьяна), derived from the Slavic word tata, cognate with ancient Greek word (τέττᾰ) [tetta], cognate with Latin atta etymology (definition) - "daddy; fatherly", meaning - "father's daughter"
3. Derived from Slavic word таить [tait`] meaning - "secretive, cagey"
4. Comes from the Latin name Tatius the name of ancient mystical king of the Sabines. No meaning.
St Tatiana is revered as holy in the Orthodox and the Roman churches.