Family name Tienou (Tienou 
) , all over the world, is a rare last name. The surname Tienou is habitual in Mali, where it is quite a rare surname, Cameroon, and France, where it is an extremely rare surname. Measured by absolute frequency, it is the most numerous in Mali, Cameroon, and the United States. Much less frequently, Tienou is the forename as well as the last name.