Cognomen Fosto (Fosto 
, Pfosten 
) , across the world, is a rare last name. The last name Fosto is habitual in Cameroon, where it is quite a rare surname, Croatia, where it is a very rare surname, and Germany. Measured by absolute frequency, the name is most common in Cameroon, Germany, and France. Very seldom, Fosto is the forename as well as the last name.