Surname אידר (Eydar 
, אידר 
) , in all the world, is a very rare cognomen. The surname אידר is habitual in Israel, where it is a rare surname, Venezuela, where it is a very rare surname, and Peru, where it is an extremely rare surname. Measured by absolute frequency, it is commonest in Israel, Venezuela, and Mexico. Also, אידר is the forename as well as the last name.