In the entire world, Isun (Isun 
) is a rare unisex given name. The given name Isun is characteristic of Indonesia, where it is a rare epicene name, Iran, where it is a very rare feminine name, and India, where it is an extremely rare gender-neutral name. In absolute terms, it is commonest in Indonesia, India, and China. Likewise, Isun is the last name as well as the forename.