Surname Сідні (Sidney 
, Сідні 
) , around the globe, is a common last name. The cognomen Сідні is characteristic of Jersey, where it is quite a common surname, Cabo Verde, and Haiti, where it is quite a rare surname. Not in comparison with a country's population, it most frequently occurs in the United States, Nigeria, and Mexico. More prevalently, Сідні is the forename as well as the last name.