Family name Mc Guinness (Mc Guinness 
) , around the globe, is a rare cognomen. The surname Mc Guinness is characteristic of Ireland, where it is quite a rare surname, Costa Rica, where it is a rare surname, and the United Kingdom. Not in comparison with a country's population, it is commonest in Ireland, the United Kingdom, and the United States.
| VARIANT | COUNTRY |
|---|---|
| Mc Guinness | United Kingdom, Spain, United States, Ireland, Costa Rica |