Cognomen Ruiu (Ruiu 
) , all over the world, is quite a rare family name. The family name Ruiu is characteristic of Aland Islands, where it is quite a common surname, Italy, where it is quite a rare surname, and Romania. In absolute terms, it is the most numerous in Italy, Romania, and France. Very seldom, Ruiu is the forename as well as the last name.
| banneddu ruiu IT (b. 1927) |
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| nicușor ruiu RO (b. 1965) |
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| cristiano ruiu Italian journalist, IT (b. 1979) |
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| grazia ruiu author of Biblioteche oggi |
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| piero ruiu researcher |
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| stefania ruiu researcher ORCID ID = 0000-0002-5854-812X |
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| roberto ruiu researcher |
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| luca ruiu researcher |
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| andrea ruiu researcher |
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| adina ruiu (b. 1975) |
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| eric ruiu Italian basketball player (1996-), IT (b. 1996) |
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| gabriele ruiu Italian motorcycle racer, IT |
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| davide ruiu Italian weightlifter, IT |
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Mr, Luca, Jose, Joel, Jody, Jean, Juan, Tora, Tore, Tony, Toni, Tino, Nico, Nina, Nino, Noah, Elio, Eric, Enzo, Enza, Emma, Frã, Lino, Ivan, Lina, Gian, Ms, Mia, Sã, Ana, Luc, Manu, Sara, Aldo, Anto, Anna, Belu, Pina, Pino, Pier, Rosa, Remo, Rick, Rino, Rita, Dado, Gaia, Gigi, and Omar