Cognomen מאטיי (Matej 
, Mattei 
, מאטיי 
) , across the world, is a common last name. The cognomen מאטיי is characteristic of Slovenia, where it is quite a common surname, Italy, and Slovakia. Not in comparison with a country's population, the name is most common in Italy, France, and Brazil. Likewise, מאטיי is the forename as well as the last name.