Cognomen Calsa (Calsa 
) , all around the world, is a rare last name. The cognomen Calsa is habitual in Philippines, where it is a rare surname, Brazil, where it is a very rare surname, and Canada, where it is an extremely rare surname. In absolute terms, it most frequently occurs in Philippines, Brazil, and India. Very seldom, Calsa is the forename as well as the last name.