All over the world, Donnacha (Donnacha 
) is a rare masculine forename. The first name Donnacha is habitual in Northern Europe, particularly Ireland, where it is quite a rare boy's name. Very seldom, Donnacha is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Donnacha | United Kingdom, Ireland, Iran, Thailand, United States |
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donnacha dennehy Irish composer, IE (b. 1970) |
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donnacha bastic Irish Gaelic football player, IE (b. 1981) |
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donnacha ryan Irish rugby union player, IE (b. 1983) |
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donnacha walsh Irish Gaelic football player, IE (b. 1984) |
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| donnacha o'dea Irish swimmer and poker player, IE (b. 1948) |
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| donnacha ó beacháin professor at Dublin City University, working on post-Soviet affairs and Irish history, IE (b. 1950) |
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| donnacha fahy Irish hurler, IE (b. 1976) |
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| donnacha j mcgrath researcher |
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| donnacha bolger Ph.D. Trinity College, Dublin 2015 |
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| donnacha cody Irish hurler, IE (b. 1985) |
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| donnacha o'briain |
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| donnacha hartnett Irish hurler, IE (b. 1996) |
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| donnacha o'brien Irish jockey, IE (b. 1998) |
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Lee, Maguire, Carroll, Cassidy, Connell, Brosnan, Kennedy, Dowling, Enright, Higgins, O'Brien, O'Dwyer, Mccarthy, Mcdonagh, Mcnamara, Sullivan, Conneely, Connolly, Kinsella, O'Mahony, O'Connell, Itsariyapanan, Hurley, Lehane, Galvin, Duggan, Ryan, Daly, Egan, Finn, Scott, Smyth, Brien, Byrne, Kenny, Dunne, O'Driscoll, Dwyer, Lynch, Tobin, Tynan, Frank, Foley, Quinn, Murray, Murphy, Curtin, Reilly, Geary, and O'Sullivan