Last name Садег (Sadegh 
, Садег 
) , in the world, is quite a rare family name. The family name Садег is characteristic of Mauritania, where it is quite a rare surname, Iran, and Estonia, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Iran, Mauritania, and the United States. More frequently, Садег is the forename as well as the last name.