Family name Donnchú (Donnchú 
) , throughout the world, is a very rare cognomen. The family name Donnchú is characteristic of Northern Europe, particularly Ireland, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Donnchú | Ireland |
| muiris ó donnchú Irish actor, IE (b. 1950) |
|
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| seán ó donnchú Irish hurler, IE (b. 1996) |
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