Distribution by county based on the Primary Valuation property surveys of 1848-64.
| Variation | Number |
| Armagh | |
| Slevin | 11 |
| Slavin | 1 |
| Slaven | 1 |
| Slavan | 6 |
| Belfast city | |
| Slevin | 4 |
| Cavan | |
| Slevin | 3 |
| Slavin | 2 |
| Clare | |
| Slavin | 1 |
| Derry | |
| Slevin | 3 |
| Donegal | |
| Slevin | 71 |
| Down | |
| Slevin | 1 |
| Slavin | 3 |
| Dublin | |
| Slevin | 4 |
| Dublin city | |
| Slevin | 4 |
| Fermanagh | |
| Slevin | 22 |
| Slavin | 3 |
| Slaven | 1 |
| Galway | |
| Slevin | 2 |
| Kildare | |
| Slevin | 8 |
| Slaven | 1 |
| Laois | |
| Slevin | 12 |
| Slavan | 1 |
| Leitrim | |
| Slevin | 17 |
| Slavin | 1 |
| Longford | |
| Slevin | 17 |
| Slavin | 3 |
| Louth | |
| Slevin | 4 |
| Mayo | |
| Slevin | 5 |
| Meath | |
| Slevin | 18 |
| Slavin | 1 |
| Sleavin | 1 |
| Monaghan | |
| Slevin | 8 |
| Slavin | 8 |
| Offaly | |
| Slevin | 10 |
| Slavin | 2 |
| Slaven | 1 |
| Roscommon | |
| Slevin | 5 |
| Tipperary | |
| Slevin | 11 |
| Slavin | 4 |
| Slaven | 1 |
| Tyrone | |
| Slevin | 45 |
| Slavin | 19 |
| Slaven | 1 |
| Slavan | 1 |
| Westmeath | |
| Slevin | 9 |
| Slavin | 6 |
| Slaven | 1 |
| Slavan | 1 |
| Sleavin | 1 |
| Wexford | |
| Slevin | 2 |