Surname Mariu (Mariu 
) , all over the world, is a rare last name. The last name Mariu is habitual in New Zealand, where it is quite a rare surname, Bulgaria, and Uruguay, where it is a rare surname. Measured by absolute frequency, it is the most numerous in Venezuela, New Zealand, and Bulgaria. More frequently, Mariu is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Mariu | Dominican Republic, Colombia, New Zealand, Romania, Venezuela |
| mariu theodorian-carada (b. 1868) |
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june mariu New Zealand Māori community leader and former sportswoman, NZ (b. 1932) |
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laura mariu New Zealand rugby league footballer, NZ (b. 1980) |
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| max mariu Roman Catholic bishop (1952-2005), NZ (b. 1952) |
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| mariu rizzu |
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| mariu bárcena Spanish actor, ES (b. 1991) |
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