Last name Ouadia (Ouadia 
, ודיע 
) , globally, is a rare family name. The last name Ouadia is habitual in Morocco, where it is quite a rare surname, Algeria, where it is a rare surname, and Finland, where it is a very rare surname. Measured by absolute frequency, this name is the most popular in Morocco, Algeria, and Spain. Also, Ouadia is the forename as well as the last name.