Last name Grei (Grei 
, Gregis 
, Грей 
) , globally, is quite a rare cognomen. The surname Grei is characteristic of Italy, where it is quite a rare surname, Albania, and Lithuania, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in Italy, Brazil, and France. Very seldom, Grei is the forename as well as the last name.