Family name Doudai (Doudai 
, Дудай 
) , in the world, is a rare last name. The cognomen Doudai is habitual in Ukraine, where it is a rare surname, Algeria, and Kyrgyzstan, where it is a very rare surname. Measured by absolute frequency, it is commonest in Ukraine, Algeria, and Russia. Much less frequently, Doudai is the forename as well as the last name.