Throughout the world, Ерно (Erno 
, Ерно 
) is quite a rare masculine first name. The forename Ерно is habitual in Finland, where it is quite a rare male name, Romania, and Hungary. Measured by absolute frequency, it is the most numerous in Brazil, the Democratic Republic of the Congo, and Indonesia. Likewise, Ерно is the last name as well as the forename.