Cognomen Decimus (Dime 
, Decimus 
, Diezmo 
) , around the globe, is quite a common family name. The last name Decimus is characteristic of North Macedonia, where it is quite a common surname, Guadeloupe, and Senegal, where it is quite a rare surname. Not in comparison with a country's population, it is commonest in Philippines, North Macedonia, and Senegal. Also, Decimus is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Dime | Philippines, Senegal, Cameroon, North Macedonia, Ethiopia |
| Decimus | Guadeloupe, Haiti, France, Dominican Republic, United States |
| Diezmo | Philippines, Mexico, Canada, United States, Saudi Arabia |
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decimus valerius asiaticus Roman consul 35 and 46, FR (b. 5) |
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decimus terentius scaurianus late 1st/early 2nd century Roman senator, governor and general (b. 50) |
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decimus iunius iuuenalis early 2nd century Roman poet, IT (b. 55) |
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| decimus iunius silanus torquatus 1st century Roman senator, consul AD 53 (b. 16) |
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| decimus junius silanus Roman senator of the Augustan era (b. 33) |
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| decimus valerius asiaticus son-in-law of emperor Vitellius (b. 35) |
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decimus iunius albinus Roman general, politician, and assassin of Julius Caesar (81–43 BC) (b. 85) |
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| decimus junius silanus lover of Vipsania Julia (b. 50) |
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| decimus plotius grypus 1st century Roman politician and senator (b. 50) |
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| decimus laelius balbus Roman consul 6 BC (b. 50) |
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| decimus terentius gentianus 2nd century Roman senator, official and suffect consul (b. 50) |
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| decimus laelius tribune of the plebs in 54 BC (b. 50) |
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| decimus turullius ancient Rome politician (b. 50) |
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| decimus iunius novius priscus 1st century Roman senator and consul (b. 50) |
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decimus clodius albinus usurper and Caesar of the Roman Empire (c.150-197), TN (b. 150) |
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Max, Dadou, Diana, Djimy, Louis, Jacob, Neite, Eldia, Elcie, Edner, Willy, Wilna, Marcus, Maksim, Maximo, Monica, Shella, Anaika, Aonghus, Carlos, Bithja, Ketsia, Ralph, Raude, Carol, Smith, Lea, Edy, Marc, Mary, Anne, Carl, Paul, Pius, Romy, Léa, Pierre, Jean, Tony, Elda, Edno, Ilne, Ivan, Marie, Merly, Sarah, Serge, Sonya, Jeff, and Ramses