Last name 悉尼 (Sidney 
, Sydney , 悉尼 
) , in all the world, is a common family name. The surname 悉尼 is characteristic of Saint Lucia, where it is quite a common surname, Jersey, and Cabo Verde (explore the name in all countries). Not in comparison with a country's population, it is commonest in the United States, Nigeria, and Australia. More frequently, 悉尼 is the forename as well as the last name.