In the world, Сиру (Cyro 
, Сиру 
) is quite a rare male forename. The forename Сиру is characteristic of Brazil, where it is quite a rare masculine name, Uruguay, and Portugal, where it is a very rare masculine name. Measured by absolute frequency, this name is the most popular in Brazil, Philippines, and Uruguay. Much less frequently, Сиру is the last name as well as the forename.