| KOC |
| Name | State | Number of records |
| KOC: MARY, FRANK, GEORGE | | 99 |
| KOCA: FRANK, JOSEPH, JAMES | | 84 |
| KOCAB: MARY, FRANK, JOHN | | 71 |
| KOCAK: JOHN, MARY, ANNA | New York | 32 |
| KOCAK: MICHAEL, JOHN, JOSEPH | | 84 |
| KOCAL: JOSEPH, FRANK, JOHN | | 30 |
| KOCAN: MARY, JOHN, MICHAEL | | 81 |
| KOCANDA: JOSEPH, JOHN, FRANK | | 49 |
| KOCAR: EDWARD, BESSIE, ANNA | | 52 |
| KOCEJA: LEONARD, ANNA, MARY | | 69 |
| KOCEN: FRANK, JOSEPH, H | | 36 |
| KOCER: JOSEPH, JAMES, VIRGINIA | | 45 |
| KOCEVAR: JOHN, MARY, FRANK | | 85 |
| KOCJAN: JOHN, JOSEPH, FRANK | | 53 |
| KOCK: ERNEST, GEORGE, BETTY | Iowa | 63 |
| KOCKA: JOHN, FRANK, JAMES | | 100 |
| KOCKELMAN: MARY, NORBERT, PHIL | | 31 |
| KOCKLER: JAMES, WILLIAM, THOMAS | | 61 |
| KOCKS: JOHN, EDWARD, MARIE | | 71 |
| KOCLANES: PETER, HELEN, JOHN | | 35 |
| KOCMAN: FRANK, JAMES, EDWARD | | 35 |
| KOCOL: STANLEY, MARY, JOSEPHINE | | 73 |
| KOCOLOWSKI: MICHAEL, WANDA, MARY | | 35 |
| KOCON: JOHN, WALTER, STANLEY | | 80 |
| KOCOR: JOHN, JOSEPH, J | | 23 |
| KOCOT: HELEN, JOSEPH, STANLEY | | 100 |
| FORD J: PARKER, OLSON, HENRY | | 43 |
| KOCOUR: CHARLES, FRANK, DOROTHY | | 56 |
| KOCUM: FRANK, JOSEPH, JOHN | | 23 |
| KOCUR: JOHN, ANNA, HELEN | Pennsylvania | 38 |
| KOCUR: JOHN, MICHAEL, GEORGE | New York | 36 |
| KOCYAN: JOSEPH, FRANK, STANLEY | | 24 |
| KOCZAK: JOHN, JOSEPH, ELIZABETH | | 37 |
| KOCZAN: JOHN, FRANK, MICHAEL | | 93 |
| KOCZELA: IGNACY, MARY, FRANK | | 21 |
| KOCZERA: STANLEY, ANNA, JOHN | | 50 |
| KOCZON: JOHN, FRANK, MARY | | 39 |
| KOCZOR: ALEX, JOSEPH, STANLEY | | 28 |
| KOCZOROWSKI: FRANK, JOSEPH, STANLEY | | 44 |
| KOCZUR: JOHN, MARY, JOSEPH | | 93 |
| SEVERN : REED, NOTTINGHAM, GUIDROZ | | 85 |
| KOCZWARA: JOHN, MARY, STANLEY | | 62 |
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