The surname Donnelly is of Irish origin, rooted in the Gaelic Ó Donnghaile, which translates to 'descendant of Donnghal'. The name Donnghal itself is derived from the elements donn, meaning 'brown' or 'dark', and gal, meaning 'valour'. Historically, the O'Donnellys were part of the Northern Uí Néill's Cenél nEoghain, tracing their lineage back to Donnghal, a notable figure who was the great-grandson of Domhnall, King of Ailech. Variations of the surname include O'Donnelly and Donley.
Ranked #1114 nationally, Donnelly was recorded 31505 times in Census. It's not a rare surname, but far from the most common — roughly 11 per 100,000 Americans bear it.
Our database contains over 14037 people with the last name Donnelly. This surname is most commonly found in Florida, New York, California. We have over 12 unique first names combined with the last name Donnelly in our records. The most frequent first names associated with this surname are John, Michael, James.
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