Family name Ó Lochlainn (Ó Lochlainn 
) , around the globe, is an extremely rare last name. The family name Ó Lochlainn is habitual in Northern Europe, particularly Ireland, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Ó Lochlainn | Ireland |
Loughlin, O Lochlainn, O'Laughlin, and O'Loughlin
| colm ó lochlainn Irish singer, IE (b. 1892) |
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| peadar ó lochlainn Irish musician (1929-2017), IE (b. 1929) |
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| fionn ó lochlainn American musician, US |
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