Last name טוסי (Tosi 
, Tusi 
, טוסי 
) , all over the world, is a common cognomen. The cognomen טוסי is habitual in San Marino, where it is quite a common surname, Italy, and Argentina, where it is quite a rare surname. Measured by absolute frequency, it is the most numerous in Italy, Argentina, and Brazil. Much less frequently, טוסי is the forename as well as the last name.