O'FLAHERTY
- 08 Jun 1908 Roberta Louise and Alfred Percy Lightbourn (Born abt 1883)
ODYE
- 04 Jun 1745 Marie (French) and Joseph Bourge (French)
OISEL
- 18 Dec 1888 Eugenie Marie and Jean Marie Kergal (Born abt 1862)
OLIVIER
- 08 Aug 1639 Marthe (St H) and Clement Chevalier Chevallier (St H) (Also Registered in St Saviour)
- 17 FEB 1771 Marie (Alderney) and Jean Patourel (Guernsey)
- 13 FEB 1774 Marianne (Brittany) and Guillaume Foune (Brittany)
OLLIVIER
- 07 May 1905 Marie Catherine (Born abt 1881) and Jean Marie Cozquer (Born abt 1880)
ONCLE
- 03 JUN 1612 Marie and Abraham Roissier
ORVIN
- 26 Apr 1897 Marie Louise (Born abt 1876) and George William Kite (Born abt 1867)
OUSON
- 07 JAN 1758 Marie (St H) and Thomas Moignard (St L)
- 10 MAR 1771 Catherine (St L) and Pierre Laurens (St L)
OZANNE
- 28 Sep 1937 Phyllis Bella (Born abt 1912) and Oscar Noel Fauvel (Born abt 1912)
OZOUF
- 11 Mar 1869 Victoire (Born abt 1829) and John Webber (Born abt 1837)