Cognomen Gadhra (Gadhra 
) , across the world, is an extremely rare family name. Predominantly, Gadhra is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Gadhra | India |
| fearghal ó gadhra Patron of the Annals of the Four Masters (b. 1604) |
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| nollaig ó gadhra Irish historian and journalist, Irish-language activist, IE (b. 1943) |
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| ruairí ó gadhra Irish king |
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| donn sléibhe ó gadhra Irish king |
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| ruaidrí ó gadhra Irish king |
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| domhnall ó gadhra Irish chieftain |
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| donn sléibhe ua gadhra Irish chieftain |
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| gadhra mór mac dundach Irish king |
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| toichleach ua gadhra King of Gailenga |
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| ferghal dubh ó gadhra |
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| ruaidri ó gadhra |
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