Family name Dunno (Dunno 
, دونو) , throughout the world, is a rare surname. The family name Dunno is habitual in Sweden, where it is a rare surname, the United States, where it is a very rare surname, and the United Kingdom. Measured by absolute frequency, this name is the most popular in the United States, Indonesia, and Sweden. Likewise, Dunno is the forename as well as the last name.