Family name Phonno (Foehn 
, Phonno 
, Föhn 
) , in all the world, is a rare last name. The last name Phonno is habitual in Switzerland, where it is a rare surname, Germany, and Australia, where it is a very rare surname. In absolute terms, the name is most common in Germany, Switzerland, and the United States. Very seldom, Phonno is the forename as well as the last name.