Surname Sdf (صدف 
, Sdf 
, سدف ) , in the entire world, is a common last name. The family name Sdf is characteristic of Taiwan, where it is quite a rare surname, Nigeria, and Sudan, where it is a rare surname. Measured by absolute frequency, the name is most common in Nigeria, Taiwan, and Bangladesh. More frequently, Sdf is the forename as well as the last name.