Last name Ерно (Erno 
, Ерно 
) , throughout the world, is quite a rare cognomen. The surname Ерно is habitual in Hungary, where it is quite a rare surname, Romania, and Philippines, where it is a rare surname. Measured by absolute frequency, the name is most common in Philippines, the United States, and Hungary. Likewise, Ерно is the forename as well as the last name.