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Last name Tadeja (Tadeja , Тадея ) , around the world, is quite a rare surname. The family name Tadeja is characteristic of Slovenia, where it is quite a rare surname, Philippines, and United Arab Emirates, where it is a rare surname. Not in comparison with a country's population, the name is most common in Philippines, Slovenia, and Poland. Likewise, Tadeja is the forename as well as the last name.