Surname Donnacha (Donnacha 
) , all over the world, is a very rare cognomen. The family name Donnacha is characteristic of Ireland, where it is a rare surname, Spain, where it is an extremely rare surname, and the United States. More frequently, Donnacha is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Donnacha | Thailand, United States, Ireland, United Kingdom, Iran |
| máirtín tom sheáinín mac donnacha Irish radio broadcaster, IE |
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| seosamh mac donnacha Irish sociolinguist, IE |
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| padraic mac donnacha |
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