Cognomen Irra (Ира 
, Irra 
, Irren 
) , across the world, is quite a common last name. The last name Irra is habitual in Moldova, where it is quite a common surname, Belarus, where it is quite a rare surname, and Kyrgyzstan. Measured by absolute frequency, it most frequently occurs in Russia, Mexico, and Moldova. More frequently, Irra is the forename as well as the last name.