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Last name Kaini (Kaini , 凯妮 , Кайни ) , in the entire world, is quite a rare surname. The cognomen Kaini is habitual in Nepal, where it is quite a rare surname, Tanzania, and Malaysia, where it is a rare surname. Measured by absolute frequency, this name is the most popular in Nepal, Tanzania, and China. More frequently, Kaini is the forename as well as the last name.