Cognomen Gretter (Gretter 
) , in the entire world, is quite a rare surname. The family name Gretter is characteristic of Uruguay, where it is quite a rare surname, Italy, where it is a rare surname, and Argentina. Not in comparison with a country's population, it is the most numerous in Brazil, Italy, and the United States. Likewise, Gretter is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Gretter | Italy, United States, Cuba, Argentina, Brazil |
| john a. gretter American Presbyterian minister (b. 1810) |
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| lystra gretter American nurse (b. 1858) |
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| joe gretter (b. 1907) |
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melisa gretter Argentinian basketball player, AR (b. 1993) |
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| susanne gretter DE (b. 1949) |
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| alessandro gretter researcher ORCID ID = 0000-0003-4794-5880 |
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