| Bedfordshire | 0 |
| Buckinghamshire | 0 |
| Berkshire | 0 |
| Cambridgeshire | 0 |
| Channel Islands | 3 |
| Cheshire | 2 |
| Cornwall | 0 |
| Cumberland | 0 |
| Derbyshire | 0 |
| Devon | 0 |
| Dorset | 0 |
| Durham | 0 |
| Essex | 0 |
| Gloucestershire | 0 |
| Hampshire | 0 |
| Herefordshire | 0 |
| Hertfordshire | 0 |
| Huntingdonshire | 0 |
| Isle of Man | 0 |
| Kent | 0 |
| Lancashire | 8 |
| Leicestershire | 0 |
| Lincolnshire | 0 |
| London | 14 |
| Middlesex | 0 |
| Northumberland | 0 |
| Norfolk | 0 |
| Northamptonshire | 0 |
| Nottinghamshire | 0 |
| Oxfordshire | 0 |
| Rutland | 0 |
| Shropshire | 0 |
| Suffolk | 0 |
| Somerset | 1 |
| Surrey | 0 |
| Sussex | 0 |
| Staffordshire | 0 |
| Warwickshire | 0 |
| Westmorland | 0 |
| Wiltshire | 0 |
| Worcestershire | 0 |
| Yorkshire | 4 |
| Anglesey | 0 |
| Brecknockshire | 0 |
| Cardiganshire | 0 |
| Carnarvonshire | 0 |
| Carmarthenshire | 0 |
| Denbighshire | 0 |
| Flintshire | 0 |
| Glamorgan | 0 |
| Merionethshire | 0 |
| Montgomeryshire | 0 |
| Monmouthshire | 0 |
| Pembrokeshire | 1 |
| Radnorshire | 0 |
| Profession | Census Frequency |
|---|---|
| Labourer | 5 |
| Independent | 2 |
| Chairwoman | 1 |
| Agricultural Labourer | 1 |
| Calico Printer | 1 |
| Grocer | 1 |
| Soldier | 1 |
| Blacking Maker | 1 |
| Painter | 1 |
| Name | Census Frequency |
|---|---|
| Mary Brennon | 118 |
| John Brennon | 94 |
| James Brennon | 61 |
| William Brennon | 42 |
| Thomas Brennon | 41 |
| Margaret Brennon | 31 |
| Michael Brennon | 31 |
| Elizabeth Brennon | 29 |
| Ellen Brennon | 28 |
| Catherine Brennon | 25 |
| Patrick Brennon | 25 |
| Ann Brennon | 24 |
| Bridget Brennon | 22 |
| Jane Brennon | 19 |
| Joseph Brennon | 17 |
| Sarah Brennon | 17 |
| Edward Brennon | 13 |
| Alice Brennon | 9 |
| Henry Brennon | 9 |
| Julia Brennon | 9 |
| Richard Brennon | 9 |
| Martin Brennon | 8 |
| Peter Brennon | 8 |
| Annie Brennon | 7 |
| Eliza Brennon | 7 |
| Rank | Surname | Match | Census Frequency |
|---|---|---|---|
| 1 | Brennan | 86% | 13,289 |
| 2 | Brannan | 71% | 7,262 |
| 3 | Brannon | 86% | 4,297 |
| 4 | Brannen | 71% | 1,584 |
| 5 | Brennen | 86% | 1,284 |
| 6 | Brennon | 100% | 947 |
| 7 | Brinnen | 71% | 134 |
| 8 | Brinnan | 71% | 132 |
| 9 | Brunnen | 71% | 109 |
The surname Brennon is the 6th most popular variant of Brennan.