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Cognomen Kalai (Kalai , Калай , กาไหล่) , all over the world, is a common family name. The cognomen Kalai is habitual in Tunisia, where it is quite a common surname, Qatar, where it is quite a rare surname, and United Arab Emirates. In absolute terms, the name is most common in India, Tunisia, and Morocco. Also, Kalai is the forename as well as the last name.