Last name Iyun (Iyun 
, 以用 ) , worldwide, is quite a rare family name. The surname Iyun is habitual in Lesotho, where it is quite a rare surname, Israel, where it is a rare surname, and Nigeria. Not in comparison with a country's population, it is the most numerous in Nigeria, Indonesia, and Lesotho. Likewise, Iyun is the forename as well as the last name.