| Index By Sept |
| Surname | | Clan | | Index |
| COSHEM | | MAC INTYRE | | |
| COSKORAN | | CARSKADDEN | | |
| COSPATRICK | | KIRKPATRICK | | |
| COSRACH | | BUCHAN | | |
| COSSKODDON | | CARSKADDEN | | |
| COSTIE | | BUCHAN | | |
| COSTIGAN | | CIAN | | |
| COSTY | | BUCHAN | | |
| COTTON | | MAC DUFF | | |
| COUGHRAN | | COCHRANE | | |
| COULL | | MAC DOUGALL | | |
| COUPAR | | MAC DUFF | | |
| COUPER | | MAC DUFF | | |
| COURSON | | KIRKPATRICK | | |
| COUSLAND | | BUCHANAN | | (var) |
| COUTIE (b) | | MAC KINTOSH / FARQUHARSON | | |
| COUTTIE (b) | | MAC KINTOSH / FARQUHARSON | | |
| COUTTS | | FARQUHARSON / CHATTAN | | |
| COUTTS | | FARQUHARSON | | |
| COUTTS (b) | | MAC KINTOSH / FARQUHARSON | | |
| COWAN | | COLQUHOUN | | |
| COWAN | | DONALD | | |
| COWAN | | MAC DOUGALL | | |
| COWEY | | FRASER | | |
| COWIE | | FRASER | | |
| COWIE | | MAC DOUGALL | | |
| COWPER | | MAC DUFF | | |
| COWRAN | | COCHRANE | | |
| COWY | | FRASER | | |
| COX | | KIRKPATRICK | | |
| CRAE | | MAC RAE | | |
| CRAIG | | GORDON | | |
| CRAIG | | KIRKPATRICK | | |
| CRAIG (var) | | CRAIG | | |
| CRAIL | | MAC DUFF | | |
| CRALE | | MAC DUFF | | |
| CRAM | | MAC DUFF | | |
| CRAMB | | MAC DUFF | | |
| CRAMBIE | | MAC DUFF | | |
| CRAMBY | | MAC DUFF | | |
| CRAMPSHEE | | GRAHAM OF MONTROSE | | |
| CRAMSIE | | GRAHAM OF MONTROSE | | |
| CRAMSY | | GRAHAM OF MONTROSE | | |
| CRANACH | | BUCHAN | | |
| CRANE | | KIRKPATRICK | | |
| CRANNACH | | BUCHAN | | |
| CRAUFORD | | KIRKPATRICK | | |
| CRAWFORD | | KIRKPATRICK | | |
| CRAWFORD (var) | | LINDSAY | | |
| CREAGH | | CIAN | | |
| CREARER | | MAC KINTOSH | | |
| CREE | | MAC RAE | | |
| | Sunday, September 30, 2020 | | | | Page 23 |