Cognomen Gaija (Gaj 
, Gaija 
) , in all the world, is quite a common last name. The cognomen Gaija is habitual in Suriname, where it is quite a rare surname, Poland, and Slovakia. Not in comparison with a country's population, it is the most numerous in Poland, India, and the United States. More frequently, Gaija is the forename as well as the last name.