Cognomen Унно (Unno 
, Juza 
, 海野 ) , in all the world, is quite a rare last name. The cognomen Унно is habitual in Czechia, where it is quite a rare surname, Slovakia, and Austria, where it is a rare surname. In absolute terms, the name is most common in Czechia, the United States, and Japan. Likewise, Унно is the forename as well as the last name.