Cognomen Гаштан (Gastão 
, Гаштан 
) , throughout the world, is a rare surname. The cognomen Гаштан is habitual in Angola, where it is quite a rare surname, Portugal, where it is a rare surname, and Ukraine, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in Angola, Portugal, and Brazil. Also, Гаштан is the forename as well as the last name.