Cognomen Oloughlin (Oloughlin 
) , around the world, is quite a rare last name. The last name Oloughlin is characteristic of Ireland, where it is quite a rare surname, Australia, and New Zealand, where it is a rare surname. Measured by absolute frequency, it is commonest in the United States, the United Kingdom, and Australia.
| VARIANT | COUNTRY |
|---|---|
| Oloughlin | Australia, New Zealand, Ireland, United Kingdom, United States |