Last name Sirov (Сиров 
, Sirov 
) , throughout the world, is a rare cognomen. The cognomen Sirov is characteristic of Ukraine, where it is a rare surname, Hungary, and Kyrgyzstan, where it is a very rare surname. Measured by absolute frequency, it is commonest in Ukraine, Russia, and Kazakhstan. Much less frequently, Sirov is the forename as well as the last name.