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Cognomen Vaida (Vaida , Vajda , Вайда ) , across the world, is a common surname. The family name Vaida is habitual in Eastern Europe, particularly Hungary, where it is quite a common surname, Romania, and Slovakia (explore the name in all countries). In absolute terms, it is commonest in Hungary, India, and Romania. Much less frequently, Vaida is the forename as well as the last name.