Cognomen Mereu (Mereu 
, Merő, Мереу 
) , throughout the world, is a common last name. The family name Mereu is characteristic of Italy, where it is quite a common surname, Romania, where it is quite a rare surname, and France, where it is a rare surname. Very seldom, Mereu is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Mereu | Romania, Brazil, France, Italy, Germany |
| Мереу | Ukraine, Russia |
| luciano mereu FR (b. 1842) |
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| peppino mereu Italian poet, IT (b. 1872) |
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antonio mereu Italian politician, IT (b. 1943) |
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| italo mereu Italian jurist, IT (b. 1921) |
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alessandro mereu Italian singer and comics artist, IT (b. 1981) |
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pietro mereu IT (b. 1972) |
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melchiorre mereu IT |
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| jean mereu French trumpeter, FR (b. 1944) |
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| angelo mereu IT (b. 1946) |
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| salvatore mereu Italian film director, IT (b. 1965) |
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| simone mereu Italian art historian (1969-), IT (b. 1969) |
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| angelo mereu IT (b. 1960) |
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| simone mereu Italian ecologist, IT |
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| carla mereu Dr. rer. nat. Universität Ulm 2015 |
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| simone mereu Italian jockey, IT (b. 1980) |
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