Cognomen Ó Ceallaigh (Kellogg 
, Ó Ceallaigh 
) , all around the world, is a common last name. The family name Ó Ceallaigh is characteristic of the United States, where it is quite a rare surname, Puerto Rico, and Ireland. Not in comparison with a country's population, this name is the most popular in the United States, Canada, and Ireland.
| VARIANT | COUNTRY |
|---|---|
| Kellogg | Israel, Puerto Rico, Canada, United States, United Kingdom |
| Ó Ceallaigh | Ireland |
| tomás ó ceallaigh Irish priest and translator, IE (b. 1879) |
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| seán ó ceallaigh Irish politician (1896-1994), IE (b. 1896) |
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| cormac ó ceallaigh Irish physicist (b. 1912) |
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philip ó ceallaigh Irish writer, IE (b. 1968) |
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| colm ó ceallaigh Irish novelist, IE (b. 1928) |
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daithí ó ceallaigh former Irish diplomat |
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| fiachra ó ceallaigh Irish bishop (1933-2018), IE (b. 1933) |
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| mícheál ó ceallaigh Irish scribe |
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| ralph ó ceallaigh Irish archbishop of Cashel |
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| aodán ó ceallaigh IE |
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