| Christopher Paul O'NEILL |
| Emily O'NEILL (10 AUG 1903 - 24 MAY 1935) |
| George Dorr O'NEILL (____ - ____) |
| Grover O'NEILL III (____ - ____) |
| Leonore Lilian O'NEILL |
| Nicolas Paul O'NEILL |
| Milton O'REAR (30 JUN 1868 - 22 NOV 1940) |
| Seborn Rainey O'REAR (5 DEC 1897 - 21 APR 1993) |
| Willard Dwayne O'REAR (26 DEC 1926 - ____) |
| Joanna O'RYAN (ABT 1557 - ____) |
| Theresa O'SHEA (____ - ____) |
| Elizabeth B. O'SULLIVAN (1927 - ____) |
| Thomas O'TOOLE (____ - ____) |
| Patricia Luisa OAKES (1951 - ____) |
| Nancy OAKLEY (ABT 1795 - ____) |
| Juanita Marie OAKS (11 JAN 1915 - 4 JUL 1976) |
| Grant Hugo OBERG (1 APR 1925 - 5 NOV 1998) |
| Ora OBERHOLTZER (____ - ____) |
| Adalberto III OBERTENGHI (____ - ABT 951) |
| Albert Azzo I OBERTENGHI (Margrave of Milan) (ABT 970 - 28 OCT 1029) |
| Albert Azzo II OBERTENGHI (Margrave of Milan) (BET 997 AND 1009 - 20 AUG 1097) |
| Hugh V OBERTENGHI (Count of Maine) (____ - 1131) |
| Oberto I OBERTENGHI (Margrave of Milan) (____ - 15 OCT 975) |
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