Where does “Tatjana” come from?

Tatjana (Latvian) comes from Russian Татья́на, from Latin Tatiana, from Latin Tatianus, from Latin Tatius.

Ancestry of “Tatjana”, step by step

Step	Language	Word	Meaning
1	Russian	Татья́на	Tatiana
2	Latin	Tatiana	—
3	Latin	Tatianus	—
4	Latin	Tatius	—

Tatjana — Etymology, Origin & Word History | Etymology Explorer