Cognomen Flatharta (Flatharta 
) , globally, is a very rare family name. The cognomen Flatharta is habitual in Northern Europe, particularly Ireland, where it is a rare surname, and the United Kingdom, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Flatharta | Ireland, United Kingdom |
| antoine ó flatharta Irish playwright and screenwriter |
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| tomás ó flatharta Gaelic Football manager, IE |
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| máirtín ó flatharta Irish radio broadcaster, IE |
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| pádraig ó flatharta Irish radio broadcaster, IE |
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| rónán ó flatharta Gaelic football player, IE |
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| john beag ó flatharta Irish radio broadcaster, IE |
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