Cognomen Ragou (Ragou 
) , in all the world, is a rare last name. The cognomen Ragou is habitual in France, where it is a rare surname, the United Kingdom, where it is an extremely rare surname, and Germany. Not in comparison with a country's population, it is the most numerous in France, India, and China. Much less frequently, Ragou is the forename as well as the last name.