Dunagan
An Irish and Scottish-style surname likely formed from a personal name with the prefix Dun-, later settled in English spelling as Dunagan.
The #9,384 most common surname in the United States (2010 Census) — about 1 in every 89,104 Americans shares it.
Etymology
Dunagan is best understood as an Anglicized surname built on the widespread Celtic element dun-, meaning “fort” or “hill,” combined with a personal-name ending that likely reflects a diminutive or patronymic form. In practice, surnames of this shape often come from an older Gaelic byname or given name that was later reshaped in English spelling. The exact original form is uncertain, so the safest reading is that it is an Anglo-Irish/Scottish surname derived from a personal name rather than a place-name or occupation.
History
The surname is most likely an Americanized spelling of an older Irish or Scottish surname that was re-formed as families migrated into English-speaking records. Spellings like Dunagan, Dunnigan, and similar forms often shifted over time, especially in 18th- and 19th-century census and parish documentation. In the United States, the name is uncommon but established, with strongest associations in Irish-descended family lines.
Origin
Regions
Variant spellings
Fun fact
Names built on dun- are widespread in Celtic place-names and surnames because the element originally meant a fort or stronghold.