Cognomen Ceallaigh (Ceallaigh 
) , worldwide, is a rare last name. The family name Ceallaigh is habitual in Ireland, where it is quite a rare surname, Australia, where it is a very rare surname, and the United Kingdom, where it is an extremely rare surname. Not in comparison with a country's population, it most frequently occurs in Ireland, the United States, and the United Kingdom. Much less frequently, Ceallaigh is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Ceallaigh | Australia, France, Ireland, United Kingdom, United States |
| muircheartach mac pilib ó ceallaigh medieval Irish archbishop |
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| diarmaid mac tadgh ua ceallaigh King of Ui Maine |
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| tomas mac muircheartaigh o ceallaigh Roman Catholic archbishop |
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| antoine ó ceallaigh Irish hurler, IE (b. 1993) |
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Mã, Seamus, Séamus, Séighin, Conall, Cormac, Ciaran, Peadar, Robert, Daltún, Damien, Déaglán, Dónal, Gearóid, Tomás, Eoghan, Hayley, Fergal, Mícheál, Seosamh, Cárthach, Padraig, Seamas, Sherry, Wayne, Oisín, Sã, Tom, Ian, Mary, Sean, Adam, Colm, Cian, Paul, Pól, Daithí, Ross, Liam, Eoin, Seán, Solas, Aodán, Keith, Tomas, Tomã, Niall, Eamon, Greg, and Diarmuid