Cognomen 萨德 (Sade 
, Thad 
, 萨德 
) , across the world, is a common family name. The last name 萨德 is characteristic of Solomon Islands, where it is quite a common surname, Estonia, and Nigeria, where it is quite a rare surname. Not in comparison with a country's population, the name is most common in Nigeria, India, and Turkey. Likewise, 萨德 is the forename as well as the last name.