Cognomen سيرا (Sira 
, Serra 
, Cera ) , all over the world, is a widespread family name. The surname سيرا is characteristic of Southern Europe, particularly Portugal, where it is a common surname, San Marino, where it is quite a common surname, and Italy (explore the name in all countries). Not in comparison with a country's population, this name is the most popular in Brazil, Italy, and Spain. Very seldom, سيرا is the forename as well as the last name.