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Cognomen Jankai (Jankai ) , throughout the world, is a rare family name. The surname Jankai is habitual in Hungary, where it is quite a rare surname, Austria, where it is a rare surname, and Thailand, where it is an extremely rare surname. Not in comparison with a country's population, this name is the most popular in Hungary, Austria, and India. More prevalently, Jankai is the forename as well as the last name.