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• Family Tree DNA - O'Keeffe Surname Group

  An O'Keeffe yDNA group has been started at Family Tree DNA. This will include the variant spellings of the surname and is open to those tested with the male O'Keeffe y-chromosomes. This group is hoping to attract those O'KEEFFE, O’KEEFE, KEEF, KEEFE, KEEFFE from around the world to form a strong base that may help each find the area their ancestors came from in Ireland.

• O'SHEA Clan Homepage

  O'Shea Clan Society set up to help O'Sheas and variant surnames with their family history. There is also an O'Shea yDNA Project.

• OGAN Genealogy

  The OGAN DNA Project is for any one interested in OGAN research. Only males with the OGAN surname and any variant spelling can test includin: OGEN, OGIN, OOGAN, O'OGAN, OUGAN, OWGAN, HOGAN, WOGAN, etc.

• O’CONCHOBHAIR, O'CONNOR, CONNER & CONNOR DNA Project

  Open to any male O'Connor, Connor(s), O'Conner or Conner(s) or man believing that he is descended from a one of these surnames. Participants are sought from all parts of the USA, Canada, Europe, Latin America and anywhere else these surnames may be found. Looking specifically for participants from the British Isles, which is believed to be the source of the names and original ancestors.

• The O MAHONY Society - Surname yDNA Project

  A surname y-DNA project to determine Ireland's O'Mahony Clan families and link emigrants and surname spelling variants.

• The O'DOWD Clan DNA Project

  DOWD surname y chromosome DNA project. Objectives include finding relationships and origins of worldwide DOWD, DOUD and O'DOWD families.