Last name Reyf (Reyf 
, Рейф 
) , in the entire world, is a very rare surname. The last name Reyf is characteristic of Kyrgyzstan, where it is a very rare surname, Ukraine, and Kazakhstan. Measured by absolute frequency, it is commonest in the United States, Russia, and Ukraine. Much less frequently, Reyf is the forename as well as the last name.