Family name Бреннан (Brennan 
, Brennon 
, Brannan ) , in all the world, is a widespread surname. The family name Бреннан is characteristic of Northern Europe, particularly Ireland, where it is a common surname, Guernsey, where it is quite a common surname, and Jersey (explore the name in all countries). In absolute terms, it is commonest in the United States, the United Kingdom, and Ireland. Much less frequently, Бреннан is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Brannan, Brennan | United Kingdom, Australia, Ireland, United States, Canada |
| Brennon | United Kingdom, Australia, United States, Canada, New Zealand |
| Бреннан | Ukraine, Russia |