O'Dochartaigh
History, heraldry and current news of the organization.

O'Kelley
Surnames: O'Kelley, O'Kelly, Kelly, Kelley. Descendants of Thomas O'Kelley.

O'Kelly Net
Kelly (O'Ceallaigh) family history and information on ancient Irish legends, Lords of ancient Ireland, the clans of Ireland, the Great Kelly Chieftains, O'Kellys Feast, and Coat of Arms.

O'Malley Clan Association
O'Malley Clan Association; includes family history, reunions and contact information.

O'Sullivan
Information on the origin and meaning of the name, as well as a brief history and coat-of-arms.

Ogasawara Clan Genealogy
Genealogical information of the descendants of Ogasawara Jiro Nagakiyo (b.1163 d.1242).

Ogbourne
Family genealogy plus information on descendants of slaves owned by Charles Harrison Ogburn of Mecklenburg, Virginia.

Ogden Forum
A place to share family genealogy.

Ogle
A Look at The Past. Genealogical research of the Hoffman, Ogle, Creech and Butz families. They settled in the state of Kansas for the most part. Genealogy Books are also listed.

Ohnmeiss
Research, archive & share information about the Ohnmeiss surname and its variations.

Oldham Family
Descendants of Calvin Oldham b:c1822, Chatham Co, NC? d:30 Sep 1864, Ft. Harris, VA m:c1846, Mary.

Olson
Descendants of Anton Olson b:July 27,1916 in Sedan, Mn.

Oshel.Com
Genealogy and history of the Oshel surname.

Ottolenghi Family
International descendants, including alternative spellings Ottolenghi, Ottolangui and Langley.

Overstreet Family
Descendants of James Overstreet b:1750 in Virginia or NC? d:16 Jan 1782 in Barnwell, SC m:in 1770, Sara Booth.

Owen
Family tree and genealogy. Includes information on Bass, Maddox and Folmsbee families.

Oxenham family history
Oxenham and Oxnam family history, includes downloadable listings, biographies, contacts and heraldry.

Oxman
Genealogy and information from many countries.