| OK |
| Name | State | Number of records |
| OK: KUNG BIN, CHAREY, FRED | | 33 |
| OKKEN: GEORGE, HARRY, ANNA | | 31 |
| OKKER: BRUNO, MARY, BEATRICE | | 28 |
| YENTA : ROZENBERG, VERKH, ROKHMAN | | 42 |
| OKLAND: JOHN, THEODORE, ARTHUR | | 100 |
| OKNER: BESSIE, ANNE, SEYMOUR | | 33 |
| OKO: JOSEPH, JOHN, STANLEY | | 61 |
| YOLANDA Y: GRAY, DAVIS, BROWN | | 42 |
| OKON: EDWARD, FREDERICK, FRANK | Michigan | 35 |
| OKON: JOSEPH, ALBERT, FRANK | Illinois | 36 |
| OKONEK: JOSEPH, STANLEY, IRENE | | 86 |
| OKONESKI: JOSEPH, ROMAN, JOHN | | 31 |
| OKONIEWSKI: EDWARD, JOSEPH, JOHN | New York | 46 |
| CASIMIR C: NABOZNY, MARCINIAK, BARCZAK | | 60 |
| OKOREN: JOHN, JOSEPH, STANLEY | | 47 |
| OKORN: FRANK, JOHN, MARY | | 70 |
| OKRASINSKI: STANLEY, JOSEPH, CATHERINE | | 73 |
| OKRASKA: MARY, HELEN, FLORENCE | | 31 |
| OKRAY: EDWARD, HELEN, FRANK | Wisconsin | 47 |
| OKRENT: SAMUEL, HARRY, LILLIAN | | 68 |
| OKRUHLIK: RUDOLPH, ANNA, MARY | | 41 |
| OKRZESIK: JOSEPH, GENEVIEVE, FRANK | | 42 |
| OKSA: JOHN, IDA, REINO | | 39 |
| OKSANEN: IDA, JOHN, KARL | | 56 |
| OKSMAN: LILLIAN, ISADORE, ABRAHAM | | 33 |
| OKTAVEC: ALBERT, JOSEPH, FRANK | | 56 |
Based on public records. Inadvertent errors are possible.
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