Cognomen Isakul (Исакул 
, Isakul 
, Исакуль ) , across the world, is a very rare surname. The cognomen Isakul is characteristic of Kyrgyzstan, where it is a rare surname, Kazakhstan, where it is a very rare surname, and India, where it is an extremely rare surname. More frequently, Isakul is the forename as well as the last name.