Surname Jansu (Jansu 
, Жансу 
, จันสุ ) , globally, is a very rare last name. The surname Jansu is characteristic of Georgia, where it is a rare surname, Estonia, and Thailand, where it is a very rare surname. Measured by absolute frequency, the name is most common in Thailand, Georgia, and France. More frequently, Jansu is the forename as well as the last name.