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Last name Seijas (Seijas , Сейхас ) , across the world, is a common surname. The surname Seijas is characteristic of Latin America and the Caribbean, particularly Venezuela, where it is quite a common surname, Uruguay, and Guatemala, where it is quite a rare surname. In absolute terms, it is the most numerous in Venezuela, Argentina, and Spain. Very seldom, Seijas is the forename as well as the last name.