| Bedfordshire | 0 |
| Buckinghamshire | 0 |
| Berkshire | 0 |
| Cambridgeshire | 0 |
| Channel Islands | 3 |
| Cheshire | 0 |
| Cornwall | 0 |
| Cumberland | 6 |
| Derbyshire | 4 |
| Devon | 7 |
| Dorset | 0 |
| Durham | 3 |
| Essex | 5 |
| Gloucestershire | 2 |
| Hampshire | 1 |
| Herefordshire | 0 |
| Hertfordshire | 1 |
| Huntingdonshire | 0 |
| Isle of Man | 0 |
| Kent | 4 |
| Lancashire | 50 |
| Leicestershire | 0 |
| Lincolnshire | 0 |
| London | 50 |
| Middlesex | 2 |
| Northumberland | 4 |
| Norfolk | 0 |
| Northamptonshire | 1 |
| Nottinghamshire | 0 |
| Oxfordshire | 0 |
| Rutland | 0 |
| Shropshire | 0 |
| Suffolk | 0 |
| Somerset | 0 |
| Surrey | 2 |
| Sussex | 0 |
| Staffordshire | 0 |
| Warwickshire | 0 |
| Westmorland | 0 |
| Wiltshire | 2 |
| Worcestershire | 0 |
| Yorkshire | 11 |
| Anglesey | 0 |
| Brecknockshire | 0 |
| Cardiganshire | 0 |
| Carnarvonshire | 0 |
| Carmarthenshire | 0 |
| Denbighshire | 0 |
| Flintshire | 0 |
| Glamorgan | 1 |
| Merionethshire | 0 |
| Montgomeryshire | 0 |
| Monmouthshire | 8 |
| Pembrokeshire | 0 |
| Radnorshire | 0 |
| Profession | Census Frequency |
|---|---|
| Scholar | 12 |
| Labourer | 6 |
| Servant | 6 |
| Clerk | 3 |
| Cotton Weaver | 2 |
| House Keeper | 2 |
| Winder Cotton | 2 |
| Domestic Servant | 2 |
| House Painter | 2 |
| Porter | 2 |
| Wharfinger | 2 |
| Woollen Weaver | 2 |
| Drum Major | 1 |
| Quartermaster Sergeant | 1 |
| Rl Irish Constab Pensioner | 1 |
| Catholic Priest D D | 1 |
| Basket Woman | 1 |
| Cotton Frame Tenter | 1 |
| Housemaid | 1 |
| Labourer Ship Yard | 1 |
| Superenuated Ireland Revenue Officer | 1 |
| Cart Man | 1 |
| Coal Miner | 1 |
| Wire Drawer Unemployed | 1 |
| Worked Weaver | 1 |
| Name | Census Frequency |
|---|---|
| Mary Brenan | 134 |
| John Brenan | 99 |
| James Brenan | 66 |
| Thomas Brenan | 56 |
| William Brenan | 49 |
| Elizabeth Brenan | 40 |
| Patrick Brenan | 40 |
| Catherine Brenan | 39 |
| Ann Brenan | 34 |
| Margaret Brenan | 30 |
| Bridget Brenan | 27 |
| Ellen Brenan | 27 |
| Edward Brenan | 25 |
| Michael Brenan | 25 |
| Jane Brenan | 24 |
| Henry Brenan | 20 |
| Sarah Brenan | 20 |
| Charles Brenan | 14 |
| Eliza Brenan | 13 |
| Joseph Brenan | 13 |
| Peter Brenan | 13 |
| David Brenan | 12 |
| George Brenan | 11 |
| Kate Brenan | 11 |
| Robert Brenan | 11 |
| Rank | Surname | Match | Census Frequency |
|---|---|---|---|
| 1 | Brennan | 86% | 13,289 |
| 2 | Brinn | 67% | 1,342 |
| 3 | Brenan | 100% | 1,296 |
| 4 | Brann | 67% | 1,189 |
| 5 | Branan | 83% | 523 |
| 6 | Branen | 67% | 438 |
| 7 | Brenen | 83% | 344 |
| 8 | Branon | 67% | 209 |
| 9 | Bronn | 67% | 207 |
| 10 | Brunn | 67% | 204 |
| 11 | Brenn | 83% | 189 |
| 12 | Bernon | 50% | 139 |
| 13 | Brinnan | 71% | 132 |
| 14 | Burnan | 67% | 126 |
| 15 | Brunnen | 57% | 109 |
| 16 | Bernan | 67% | 103 |
The surname Brenan is the 3rd most popular variant of Brennan.