| O |
| Name | State | Number of records |
| O: YONG, YOUNG, SUN | | 98 |
| EDWARD THOMAS: SMITH, COOK, DOYLE | | 103 |
| O-BRIEN: WILLIAM, JOHN, FRANCIS | | 84 |
| O CONNELL: JOHN, MARY, ROBERT | | 68 |
| O-CONNOR: FRANCIS, DOROTHY, CHARLES | | 44 |
| O DELL: MARION, RONALD, MARK | | 34 |
| O DONNELL: JOHN, JAMES, THOMAS | | 100 |
| O-DONNELL: JOHN, JAMES, ELIZABETH | | 28 |
| O HARA: MICHAEL, JOHN, PATRICK | | 42 |
| O KEEFE: JAMES, FRANCIS, DANIEL | | 40 |
| O LEARY: JOHN, ROBERT, ELIZABETH | | 47 |
| O MALLEY: JAMES, JOHN, EVELYN | | 31 |
| O NEAL: MICHAEL, WILLIAM, DANIEL | | 84 |
| O-NEAL: JAMES, BETTY, WILLIAM | | 35 |
| O NEIL: MARY, JOHN, LOUIS | | 60 |
| O NEILL: JAMES, JOHN, CHARLES | | 77 |
| O-NEILL: JOHN, JAMES, DOROTHY | | 28 |
| MYLES L: ALLEN, HOWARD, FOUNTAIN | | 56 |
| O REILLY: KURT, SHAUN, EILEEN | | 27 |
| O ROURKE: JOHN, CHRISTINE, JAMES | | 54 |
| O SHEA: MARY, JOHN, WILLIAM | | 26 |
| O SULLIVAN: PATRICIA, DENIS, JOHN | | 42 |
| O-SULLIVAN: JAMES, JOHN, JOSEPH | | 24 |
| O TOOLE: JOHN, MARY, LAWRENCE | | 25 |
Based on public records. Inadvertent errors are possible.
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