Last name Cathail (Cathail 
) , all around the world, is a very rare cognomen. The last name Cathail is characteristic of Ireland, where it is a rare surname, the United Kingdom, where it is an extremely rare surname, and Brazil. Very seldom, Cathail is the forename as well as the last name.
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| Cathail | Ireland, United Kingdom, Brazil |
| domnall mac cathail Irish king (b. 601) |
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| ailill mac cathail King of Munster (b. 601) |
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| artgal mac cathail 8th-century Irish monarch |
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| donn cothaid mac cathail Irish king |
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| dub-indrecht mac cathail King of Connacht |
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| gilla mo choinni ua cathail King of Uí Fiachrach Aidhne |
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| tadg mac cathail King of Connaught |
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| lorcan mac cathail King of Uisnech and Mide |
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| áed rón mac cathail King of the Uí Failge |
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| donnubán mac cathail King of Uí Fidgenti |
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| finguine mac cathail King of Munster |
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| artrí mac cathail Irish king |
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| donell dubh ó cathail Irish musician, IE |
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| mícheál ó cathail Irish hurler, IE (b. 1989) |
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