Cognomen เร็กซ์ (Rek 
, Rexh 
, เร็กซ์ 
) , across the world, is quite a common last name. The cognomen เร็กซ์ is characteristic of Slovenia, where it is quite a rare surname, Czechia, and Poland. Not in comparison with a country's population, it most frequently occurs in Algeria, Poland, and Egypt. Likewise, เร็กซ์ is the forename as well as the last name.