Surname راتو (Ratu 
, Rato 
, Ratto ) , in the entire world, is a common cognomen. The surname راتو is characteristic of Fiji, where it is a common surname, Portugal, where it is quite a common surname, and Solomon Islands. Measured by absolute frequency, this name is the most popular in Argentina, Portugal, and Italy. More frequently, راتو is the forename as well as the last name.