Family name 西尔 (Sier 
, Seale 
, 西尔 ) , around the world, is a common last name. The last name 西尔 is characteristic of Barbados, where it is quite a common surname, Lesotho, and Trinidad and Tobago, where it is quite a rare surname. Not in comparison with a country's population, the name is most common in the United States, South Africa, and the United Kingdom. Very seldom, 西尔 is the forename as well as the last name.