From Jerripedia
O'Brien
- Descendants of Bridget O'Brien Added 2017
- Descendants of Michael O'Brien Added 2020
- Descendants of Edward O'Brien Added 2020
- Descendants of Joseph Odell NEW
- Descendants of Pierre Ogier
- Descendants of Thomas Oliver
- Descendants of James Oliver
- Descendants of George Oliver
- Descendants of Richard Orange and Mary Bisson
- Descendants of Berthelot Orange
- Descendants of John Orchard NEW
- Descendants of Robert Orchard NEW
- Descendants of John William Orviss
- Descendants of William Orviss
- Descendants of William Osborne
- Descendants of John Osment
- Descendants of Philippe Joseph Oulez
- Descendants of Nicolas Ozanne NEW
- Descendants of John Ozard NEW