Surname Garrahan (Garrahan 
) , around the globe, is a rare last name. The cognomen Garrahan is habitual in Argentina, where it is a rare surname, Ireland, and the United States. Not in comparison with a country's population, it is commonest in the United States, Argentina, and the United Kingdom.
| VARIANT | COUNTRY |
|---|---|
| Garrahan | Belgium, Argentina, United Kingdom, United States, Ireland |
|
juan pedro garrahan Argentinian physician (1893-1965), AR (b. 1893) |
|
|
matthew garrahan British journalist, GB |
|
| juan p garrahan researcher |
|