Surname សិរ (Sira 
, សិរ 
) , worldwide, is a common family name. The last name សិរ is habitual in Venezuela, where it is quite a common surname, Spain, where it is quite a rare surname, and Slovakia. Not in comparison with a country's population, it is the most numerous in India, Venezuela, and Nigeria. Likewise, សិរ is the forename as well as the last name.