Family name Kalkai (Kalkai 
) , worldwide, is a very rare last name. The last name Kalkai is habitual in Israel, where it is a rare surname, Georgia, where it is a very rare surname, and the United States, where it is an extremely rare surname. In absolute terms, it is the most numerous in the United States, Israel, and India. More frequently, Kalkai is the forename as well as the last name.