Cognomen Fidelio (Fidelio 
, Фиделио 
) , across the world, is quite a rare surname. The surname Fidelio is habitual in Cuba, where it is quite a rare surname, Mexico, where it is a rare surname, and Italy. Also, Fidelio is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Fidelio | Brazil, Italy, Mexico, Mozambique, Cuba |
| Фиделио | Kyrgyzstan |
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fidelio f. finke Czech composer, DE (b. 1891) |
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fidelio ponce de león Cuban painter (1895-1949), CU (b. 1895) |
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| fidelio hungo Cuban baseball player (b. 1893) |
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| fidelio a. jimenez member or fellow of the New York Academy of Medicine |
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| carmelo fidelio Italian musician and music arranger, IT |
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| gerardo daniel fidelio researcher ORCID ID = 0000-0001-6234-6814 |
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| pascual fidelio |
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| fidelio finzi |
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| fidelio unger |
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