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Family name Sira (Sira
, ศิระ
, สิระ
) , all over the world, is a common cognomen. The last name Sira is habitual in Venezuela, where it is quite a common surname, Spain, where it is quite a rare surname, and Slovakia. In absolute terms, it is the most numerous in India, Venezuela, and Nigeria. Also, Sira is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Sira | India, Nigeria, Ethiopia, Thailand, Venezuela |
| สิระ, ศิระ | Thailand |
| Сира | Bulgaria, Kazakhstan, Russia, Ukraine |