Family name Breathnach (Breathnach 
) , globally, is a rare cognomen. The cognomen Breathnach is characteristic of Ireland, where it is quite a common surname, New Zealand, where it is a very rare surname, and Australia. Not in comparison with a country's population, it most frequently occurs in Ireland, the United Kingdom, and the United States.
| pádraig breathnach Irish priest and song collector (1848-1930) (b. 1848) |
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| lughaidh breathnach Irish nationalist (1880–1942), IE (b. 1880) |
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| mícheál breathnach Irish writer (1881-1908) (b. 1881) |
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| micheál breathnach Irish writer (1886-1987), IE (b. 1886) |
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| cormac breathnach Irish politician (1886-1956), IE (b. 1886) |
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| pádraig breathnach Irish teacher and civil servant (1890-1939), IE (b. 1890) |
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declan breathnach Irish politician, IE (b. 1959) |
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| breandán breathnach Irish uilleann piper and music collector (1912-1985), IE (b. 1912) |
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| deasún breathnach Irish writer (b. 1921) |
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| séamus breathnach IE (b. 1915) |
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| oilibhéar breathnach Irish hurler (1937-1996), IE (b. 1937) |
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ualtar breathnach Irish hurler, IE (b. 1991) |
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| pádraic breathnach Irish writer (b. 1942), IE (b. 1942) |
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| seán bán breathnach Irish television personality, IE (b. 1949) |
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| pádraic breathnach Irish actor (b. 1956), IE (b. 1956) |
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Mr, Cian, Bart, Brid, Kath, Kate, Pól, Ross, Rian, Ruth, Dean, Lisa, Liam, Luke, Jane, Jack, John, Tara, Tony, Tina, Tuan, Edel, Clã, Emer, Colm, Aodh, Ms, Mã, Sã, Ann, Amy, Kim, Pol, Dee, Luc, Joe, Ian, Una, Marc, Mark, Moss, Sian, Sean, Seã, Alan, Anne, Aine, Cara, and Emma