Family name Эрно (Erno 
, Empu 
, Ernö 
) , worldwide, is quite a rare last name. The cognomen Эрно is characteristic of Hungary, where it is quite a rare surname, Romania, and Philippines, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Philippines, the United States, and Indonesia. More frequently, Эрно is the forename as well as the last name.