Cognomen 西蒂 (Siti 
, Citti 
, 西蒂 
) , in the world, is a common last name. The family name 西蒂 is characteristic of South-eastern Asia, particularly Brunei, where it is quite a common surname, Indonesia, and Malaysia. Measured by absolute frequency, the name is most common in Indonesia, Ethiopia, and Malaysia. Much more frequently, 西蒂 is the forename as well as the last name.