Surname Guglielmo (Guglielmo 
, Gulielmus 
) , globally, is quite a common last name. The last name Guglielmo is habitual in Italy, where it is quite a rare surname, Argentina, and Switzerland. In absolute terms, it is commonest in Italy, the United States, and Argentina. More prevalently, Guglielmo is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Guglielmo | Brazil, Italy, Argentina, United States, France |
| Gulielmus | Spain, South Africa, Belgium |
Bill, Ghilherme, Guglielmi, Guilhem, Guilherme, Guilhèm, Guillaume, Guillem, Guillen, Guillermo, Guillén, Gwilherm, Gwilym, Gwyllym, Vilem, Vilhelm, Viljem, Vilmos, Vilém, Wilhelm, Wilhelm Carl, Wiliam, Will, Willem, William, Wm., Μπιλ, Бил, Билл, Біл, Білл, Вил, Вилем, Вилл, Виллем, Вилль, Вилмос, Вилмош, Вилхелм, Вильгельм, Вильем, Вильмош, Вильям, Вилям, Вілем, Вільгельм, Вільмош, Вільям, Гийом, Гильен, Гильерме, Гильермо, Гуглиелмо, Гугліельмо, Гійом, Гільєн, Гільєрмо, Уилл, Уильям, Уилям, Уільям, ביל, גוליאלמו, גיום, ווילהעלם, וויליאם, וילהלם, ויליאם, וילם, بيل, وليام, ولیم, ويل, ويلهلم, ويليام, ويليم, ویلیام, উইলিয়াম, বিল, ウィリアム, ウィル, ウイリアム, ギョーム, ギヨーム, ビッグ, ビル, 古林, 吉恩, 吉拉姆, 吉連, 威尔, 威廉, 比尔, and 維倫
| giovanni da san guglielmo Italian presbyter, IT (b. 1552) |
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| filippo guglielmo, barone di saint remy pallavicino delle frabose IT (b. 1662) |
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| pasquale guglielmo italian composer (b. 1810) |
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giovanni di guglielmo Italian hematologist, IT (b. 1886) |
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| victor guglielmo IT (b. 1860) |
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| carmelina di guglielmo Australian actress, AU (b. 1901) |
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| renato di guglielmo author (20th century) (b. 1901) |
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| rino guglielmo Italian painter (1910-1994), IT (b. 1910) |
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| augie guglielmo American baseball umpire (b. 1915) |
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| raymond guglielmo French geographer (1923-2011), FR (b. 1923) |
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| tony guglielmo American politician, US (b. 1940) |
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giorgio guglielmo volleyball player, IT (b. 1996) |
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lucia di guglielmo Italian association football player, IT (b. 1997) |
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| anna guglielmo botanist, IT (b. 1948) |
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| pascal de guglielmo (b. 1947) |
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Pepe, Santoro, Stabile, Chimera, Carbone, Colombo, Bianchi, Rossini, De Luca, De Rosa, Manenti, Gentile, Ferrari, Bernardi, Grimaldi, Giordano, Elefante, Esposito, Fiorillo, Bianchini, Guglielmi, Trovato, Marconi, Martino, Zanchi, Rosa, Zisa, Manzo, Conti, Costa, Bruno, Buono, Rossi, Ricci, Rizzo, Russo, Gallo, Galli, Greco, Fiore, Marino, Aprile, Caruso, Pagano, Romano, Fabbri, Vitaliani, and Carnemolla