Surname Ilyia (Ilyia 
, Илыиа 
) , in the world, is a very rare family name. The cognomen Ilyia is characteristic of Malaysia, where it is a very rare surname, Nigeria, and the United Kingdom, where it is an extremely rare surname. In absolute terms, it is commonest in Nigeria, Malaysia, and the United States. More prevalently, Ilyia is the forename as well as the last name.