Last name Harnaga (Harnaga 
) , around the world, is a very rare cognomen. The cognomen Harnaga is habitual in Argentina, where it is a very rare surname, Canada, and the United States, where it is an extremely rare surname. In absolute terms, this name is the most popular in Argentina, the United States, and India. Very seldom, Harnaga is the forename as well as the last name.