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Family name Hallai (Hallai ) , around the globe, is a rare last name. The family name Hallai is habitual in Hungary, where it is quite a rare surname, Greece, where it is a rare surname, and Tanzania, where it is a very rare surname. Not in comparison with a country's population, this name is the most popular in Nigeria, Hungary, and Brazil. Likewise, Hallai is the forename as well as the last name.