Cognomen Lioy (Lioy 
) , worldwide, is quite a rare surname. The surname Lioy is habitual in Argentina, where it is a rare surname, Italy, and Uruguay. Not in comparison with a country's population, it is the most numerous in Italy, Argentina, and the United States. Very seldom, Lioy is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Lioy | Romania, Argentina, Italy, Brazil, United States |
| felice lioy Italian lawyer and politician, IT (b. 1743) |
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paolo lioy Italian naturalist and politician, IT (b. 1834) |
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| giuseppe lioy Italian politician, IT (b. 1837) |
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| diodato lioy Italian journalist, IT (b. 1839) |
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| paul j. lioy American scientist, US (b. 1947) |
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| antonio lioy Italian professor, IT (b. 1958) |
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| dan lioy (b. 1958) |
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| simone lioy researcher |
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| virginia s lioy researcher |
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| ernesto lioy researcher |
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Mr, Lara, Lisa, Lori, Luis, Luiz, Jane, Jano, Jose, John, Joao, Jean, Juan, Tony, Tina, Nico, Nina, Nino, Elsa, Eric, Erik, Hugo, Geno, Dyna, Ryan, Rita, Ana, Amy, Bob, Kem, Dan, Teo, Mary, Mati, Maxi, Mike, Vito, Sean, Anna, Anne, Adam, Axel, Cami, Paul, Pino, Raul, Rosa, Rose, Aldo, and Vera