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O'Sullivan Clan Gathering in Ireland Breaks World Record

Guinness World Records verified 1,848 participants after the clan drew namesakes from Ireland and abroad to reclaim the top spot from the Gallaghers.

  • On Saturday, the O'Sullivan clan gathered in Castletownbere, County Cork, breaking the Guinness World Record for largest surname gathering with 1,848 verified participants.
  • Organizers launched weeks of social media campaigning urging Sullivans and O'Sullivans worldwide to surpass the 1,488 Gallaghers who set the previous record in Letterkenny, County Donegal, in 2007.
  • Participants traveled from as far as Mexico and Boston to join the event, with officials verifying attendees via passport checks and counting them in groups of fifty on a school's football pitch.
  • Guinness World Record Authenticator Prav Patel confirmed the milestone, declaring the clan the new title holders, while organizer Jim O'Sullivan said, "But people turned out in their numbers, and we did it."
  • The surname, meaning 'hawk-eyed' in Gaelic, ranks among Ireland's most common names, with over 500,000 O'Sullivans and Sullivans worldwide maintaining strong ties across the Irish diaspora in North America.
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Nearly 2,000 Sullivan and O-Sullivan gathered in Ireland on Saturday to take on an unusual challenge: breaking the world record for the largest gathering of people with the same family name. "An extraordinary sensation." Nearly 2,000 people named Sullivan or O-Sullivan gathered in Cork County, Ireland, on Saturday to beat the world record for the number of people with the same name gathered in one place.--1.848 Sullivan or O-Sullivan gathered in…

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O'Sullivan clan gathering in Ireland breaks world record

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RÚV broke the news on Sunday, May 31, 2026.
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