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Cognomen Gallagher (Gallagher
, גלאגר
, Галлахер
) , worldwide, is a widespread last name. The surname Gallagher is characteristic of Ireland, where it is a common surname, Marshall Islands, and Isle of Man, where it is quite a common surname (explore the name in all countries). Not in comparison with a country's population, it is commonest in the United States, the United Kingdom, and Ireland.