Cognomen Джансу (Cansu 
, Джансу 
, Djansu ) , all around the world, is quite a common surname. The last name Джансу is habitual in Turkey, where it is quite a rare surname, Switzerland, where it is a rare surname, and Bulgaria. Measured by absolute frequency, it is the most numerous in Turkey, Germany, and Switzerland. More frequently, Джансу is the forename as well as the last name.