Cognomen Ритхи (Rithy 
, Ритхи) , around the world, is a rare surname. The last name Ритхи is characteristic of Cambodia, where it is quite a rare surname, Malaysia, where it is a very rare surname, and France. Measured by absolute frequency, it is the most numerous in Cambodia, Malaysia, and the United States. More frequently, Ритхи is the forename as well as the last name.