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Last name Brennan (Brennan , ברנן , Бреннан ) , all over the world, is a common family name. The family name Brennan 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). Not in comparison with a country's population, the name is most common in the United States, Ireland, and the United Kingdom. Very seldom, Brennan is the forename as well as the last name.