Surname Tonan (Tonan 
, تونان) , all over the world, is quite a rare last name. The cognomen Tonan is characteristic of Japan, where it is quite a rare surname, Ivory Coast, where it is a rare surname, and Italy. Measured by absolute frequency, the name is most common in Japan, Ivory Coast, and Philippines. Also, Tonan is the forename as well as the last name.