Last name Рейни (Reini 
, Rainey 
, Rejni 
) , in all the world, is a common cognomen. The last name Рейни is habitual in British Virgin Islands, where it is quite a common surname, Ireland, where it is quite a rare surname, and the United States. Measured by absolute frequency, it is the most numerous in the United States, the United Kingdom, and Canada. Likewise, Рейни is the forename as well as the last name.