Cognomen ษิร (Sira 
, ษิร 
) , globally, is a common family name. The surname ษิร is habitual in Venezuela, where it is quite a common surname, Spain, where it is quite a rare surname, and Slovakia. In absolute terms, this name is the most popular in India, Venezuela, and Nigeria. Also, ษิร is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sira | Venezuela, Senegal, India, Ethiopia, Nigeria |
| ษิร | Thailand |