Cognomen Tanâ (Таня 
, Tanâ) , across the world, is a common last name. The cognomen Tanâ is characteristic of Moldova, where it is quite a common surname, Belarus, and Armenia, where it is quite a rare surname. Not in comparison with a country's population, it is the most numerous in Eastern Europe, particularly Russia, Belarus, and Moldova. More prevalently, Tanâ is the forename as well as the last name.