Family name ไอยู (Iyoo 
, Iyuh 
, ไอยู 
) , worldwide, is a rare cognomen. The cognomen ไอยู is habitual in Nigeria, where it is a very rare surname, Indonesia, and Malaysia, where it is an extremely rare surname. Measured by absolute frequency, the name is most common in Indonesia, Nigeria, and Thailand. Likewise, ไอยู is the forename as well as the last name.