Cognomen Sydi (Sydi 
) , around the world, is a rare last name. The surname Sydi is characteristic of Senegal, where it is quite a rare surname, Singapore, where it is a very rare surname, and Malaysia, where it is an extremely rare surname. Measured by absolute frequency, it most frequently occurs in Senegal, Singapore, and Brazil. Much less frequently, Sydi is the forename as well as the last name.