Surname Амадеус (Amadeus 
, Amadey 
, Амадеус 
) , worldwide, is quite a rare last name. The cognomen Амадеус is characteristic of Bulgaria, where it is quite a rare surname, Serbia, where it is a rare surname, and Indonesia. Not in comparison with a country's population, it is commonest in Indonesia, Brazil, and Argentina. More frequently, Амадеус is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Amadeus | Germany, Indonesia, Tanzania, Argentina, Brazil |
| Amadey | Mexico, United States, Tanzania, Argentina, Brazil |
| Амадеус | Kyrgyzstan, Ukraine |
Aba, Amade, Amadej, Amadeo, Amadeous, Amadeu, Amadeusz, Amadio, Amadé, Amedea, Amedee, Amedeo, Amédée, Teofil, Teofilo, Teofilus, Teófilo, Theofiel, Theofilos, Theophil, Theophile, Theophilus, Théophile, Θεόφιλος, Амадео, Амадеу, Амадио, Амеде, Амедео, Теофил, Теофило, Теофилос, Теофилус, Теофіл, Теофілус, Теофіль, Феофил, אמדאוס, אמדה, and アナスタシア