Throughout the world, Adier (Adier 
) is a rare epicene forename. The given name Adier is habitual in Romania, where it is a rare male name, Colombia, where it is a very rare boy's name, and Mexico. Measured by absolute frequency, it is commonest in Latin America and the Caribbean, particularly Mexico, Brazil, and Colombia. More prevalently, Adier is the last name as well as the forename.