Surname 宇城 (宇城 
, Ushiro 
) , throughout the world, is a rare last name. The surname 宇城 is habitual in Hong Kong, where it is a rare surname, Brazil, where it is a very rare surname, and Argentina. Measured by absolute frequency, it is the most numerous in China, Brazil, and the United States. More frequently, 宇城 is the forename as well as the last name.