- Ockenden (continued)
- Odd
- Dorcas (between 1827 and 1828 - circa 1902)
- James (before 1808 - )
- Sarah (before 1808 - )
- Sarah (1826 - circa 1894)
- Odeman
- Odemar
- Odman
- Oehlke
- Ogden
- Oglander
- Ognall
- Oke
- Okeover
- Jane (before 1565 - 1620)
- Oldaker
- Oldfield
- Oldroyd
- Olenick
- Oliphant
- Olive
- Oliver
- Oliverson
- Ollard
- Ollerhead
- Olliff
- Ollis
- Olney
- Olschewski
- Olsen
- Olson
- Olund
- Olver
- Martha (between 1856 and 1857 - 1929)
- Onassis
- Ongley