Surname Iyon (Ion 
, Iyon 
) , all over the world, is a widespread last name. The family name Iyon is characteristic of Romania, where it is a common surname, Moldova, and Equatorial Guinea, where it is quite a rare surname. Measured by absolute frequency, this name is the most popular in Romania, Moldova, and Spain. More frequently, Iyon is the forename as well as the last name.