25 results
| Surname | Cluster |
Coill Ó Coill ga  | Coll |
Coill Uí Choill ga  | Coll |
| Coill Ní Choill ga | Coll |
| Coll en | Colla |
| Coll en | Colla |
| Quill en | Coll |
| Codlatáin Mac Codlatáin ga | Collatán |
| Codlatáin Mhic Codlatáin ga | Collatán |
| Codlatáin Nic Codlatáin ga | Collatán |
| Colla Mac Colla ga | Colla |
| Colla Ó Colla ga | Colla |
| Colla Uí Cholla ga | Colla |
| Colla Mhic Colla ga | Colla |
| Colla Nic Colla ga | Colla |
| Colla Ní Cholla ga | Colla |
| Collatáin Mac Collatáin ga | Collatán |
| Collatáin Mhic Collatáin ga | Collatán |
| Collatáin Nic Collatáin ga | Collatán |
| Colleran en | Callarán |
| Collier en | Coiléir |
| Collins en | Coileán |
| Collopy en | Colpa |
| Culleton en | Collatán |
| Cully en | Colla |
| Cully McCully en | Colla |