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Surname Haj (Hai , Haj , Хай ) , all over the world, is a widespread family name. The cognomen Haj is habitual in Malaysia, where it is quite a common surname, Lebanon, and Macao (explore the name in all countries). Not in comparison with a country's population, this name is the most popular in China, Malaysia, and Vietnam. Also, Haj is the forename as well as the last name.