Last name Ó Cadhla (Kiely 
, Ó Cadhla ) , around the globe, is a common family name. The cognomen Ó Cadhla is habitual in Ireland, where it is quite a common surname, Aland Islands, and Reunion. In absolute terms, this name is the most popular in Ireland, the United States, and the United Kingdom. Much less frequently, Ó Cadhla is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Kiely | United Kingdom, Australia, Ireland, United States, Canada |
| Ó Cadhla | Ireland |
| pádraig ó cadhla Irish teacher, IE (b. 1875) |
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| seán ó cadhla Irish language author, IE (b. 1885) |
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