All surnames

Irish surname

Duffy

Descendant of Dubhthach

Clan or community name

Duffy (Ó Dubhthaigh) means 'descendant of Dubhthach', a personal name derived from dubh 'black' or 'dark'. Several distinct families bore the name, notably in Counties Monaghan, Donegal, and Roscommon.

The surname is common throughout Ireland, especially in Ulster and Connacht. Variants include O’Duffy and Duff. It remains a frequent Irish name and is well represented in the diaspora.

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Frequently asked questions

What does the surname Duffy mean?+

Descendant of Dubhthach. From Irish "dubh" (dark/black), describing hair or complexion.

Is Duffy a common surname?+

Duffy is a Irish-origin surname. Popularity varies widely by country and region, and the same surname can be common in one place and rare in another.

Can two families with the same surname be unrelated?+

Yes. Surnames, especially occupational and descriptive ones like this, were often adopted independently by many unrelated families who happened to share a trade, appearance, or location.

Is my search logged?+

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