Family name Tiwn (Tune 
, Tiwn ) , worldwide, is quite a common cognomen. The family name Tiwn is habitual in Ethiopia, where it is quite a rare surname, the United Kingdom, where it is a rare surname, and Norway. In absolute terms, it is the most numerous in the United States, Ethiopia, and the United Kingdom. Likewise, Tiwn is the forename as well as the last name.