Cognomen Татиан (Tatian 
, Taciani 
, Татиан 
) , across the world, is a rare last name. The cognomen Татиан is habitual in Moldova, where it is quite a rare surname, Romania, where it is a rare surname, and Afghanistan. Not in comparison with a country's population, it is commonest in India, Romania, and Afghanistan. Likewise, Татиан is the forename as well as the last name.