Family name Тадея (Tadeja 
, Тадея 
, Majeric 
) , all over the world, is quite a rare cognomen. The cognomen Тадея is characteristic of Slovenia, where it is quite a common surname, Philippines, where it is quite a rare surname, and Serbia, where it is a rare surname. Measured by absolute frequency, it most frequently occurs in Philippines, Slovenia, and Poland. Likewise, Тадея is the forename as well as the last name.