Cognomen Деру (Deroo 
, Деру 
) , around the world, is quite a rare surname. The cognomen Деру is habitual in Belgium, where it is quite a rare surname, France, and Egypt, where it is a rare surname. In absolute terms, the name is most common in France, Belgium, and the United States. Much less frequently, Деру is the forename as well as the last name.