Surname Gelain (Gelain 
) , worldwide, is quite a rare cognomen. The surname Gelain is habitual in Italy, where it is quite a rare surname, Brazil, where it is a rare surname, and France. Much less frequently, Gelain is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Gelain | France, Argentina, Italy, Brazil, Democratic Republic of the Congo |
| henrique gelain Brazilian priest, BR (b. 1910) |
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| ezio gelain Italian association football player, IT (b. 1961) |
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| daniel pens gelain researcher |
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| lucas gelain researcher |
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| maria elena gelain researcher ORCID ID = 0000-0002-8633-0988 |
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| fabrizio gelain researcher |
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| arianna gelain Italian researcher, IT |
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