1. Margaret Lucy NEAD was born about 1802 in Dublin. She died 19 Nov 1868 in 29 Haymarket, London.

According to both the 1841 and 1851 censuses of England, Margaret and her husband, George Butler, and their family were living at 1 Francis Court in the parish of St. Paul, Covent Garden in Westminster. By the time of the 1861 census, they were living at 57 Greek St. (where their musical instrument business was located) in the parish of St. Anne in Westminster and at the time of Margaret's death in 1868 they were at 29 Haymarket, where their shop was located. Margaret died from "dropsy" (an old term for the swelling of soft tissues due to the accumulation of excess water, often due to congestive heart failure").

We know that Margaret was born in Dublin from the 1851 census of England, and we know her surname from the birth certificates of her twins, Margaret and Thomas. It's rather difficult to decipher the surname on the certificate but it's almost certainly Nead, a very unusual but not unknown name in Ireland. I have tried to locate copies of birth certificates for Margaret's other children who were born from 1937 onwards (civil registration of births began in July 1837) in order to verify her surname but none, apart from those of the twins (therefore both in the same handwriting), were found by the General Register Office for England and Wales.

Searches made to determine the Irish county or counties with the highest concentration of Nead families didn't reveal anything very useful but records were located for the following Nead individuals or families:

Griffith's Valuation (1847-1864):  Michael Nead, occupier of land in the parish of Cloonygormican, Co. Mayo; Julia Nead, occupier in the parish of Killulagh in Co. Westmeath
Dublin City Census (1851): Pk. (Patrick?) Neade, 1 Hammond Lane in the parish of Michan's in Dublin; Jno. (John?), 17 Hammond Lane in St. Michan's
1841 Census of England: Mary Nead, Liverpool, born c.1791 Ireland; Michael, Croydon, born c.1821 Ireland
1851 Census of England: Catherine Nead, born c.1813 Co. Cork, married to English-born Thomas Nead; James Nead, born c.1824 Mayo and his wife, Elizabeth, born c.1811 Cork, living St. Pancras, London
1861 Census of England: No Irish-born Neads recorded
1871 Census of England: No Irish-born Neads recorded
1881 Census of England: Ann Nead, born c.1830 Ireland, married to English-born John Nead, living Wigan; Thomas Nead, born c.1824 Ireland; his wife, Eliza, born c.1819 Ireland; their son Michael, born St. Pancras, all living St. George, Bloomsbury; James Nead, born c.1857 Ireland, lodger in Cumberland; Thomas Nead, born c.1861 Ireland, lodger in Cumberland
1891 Census of England: Julia Nead, born c.1818 Co. Cork, living Shoreditch
1901 Census of England: Joseph Nead, born c.1864 Ireland and his wife, Mary, born c.1856, living Sale

Margaret married George BUTLER in prob. abt 1825 in prob. Dublin. George was born about 1795 in Dublin. He died in prob. London.

The farthest back we can trace our Butler family is to George Butler, a musical instrument maker, who, according to William Waterhouse's "The New Langwill Index: A Dictionary of Musical Wind-Instrument Makers and Inventors" (London, T. Bingham, 1993), "flourished in Dublin from 1826 as a successor to a Mr. Dollard, maker of flute, Kent-bugle, serpent and bass-horn".

It appears George moved to London probably in the late 1820s or early 1930s while still maintaining the business in Dublin. It seems he worked for others in London for a number of years (the 1851 census of England shows that George, along with his son George, was working as a "journeyman trumpet maker"), but in 1859 it's believed he set up his first London shop at 17 Brydge's St. in Covent Garden.

In Dublin it's possible George's workshop was located for a time on Capel St. because the only Griffiths Valuation entries for a George Butler in the entire city of Dublin are for (i) 155 and 156 Capel St (warehouse, house, warerooms and small yard) and (ii) an address on what seems to be a lane between 13 and 14 Strand St. Little (just off Capel St.) where an office was rented. Part of Strand St. Little runs behind shops on the river end of Capel St. where numbers 155 and 156 are located. Griffiths Valuation was undertaken for the Capel St. area in May of 1854.   

It's possible George died in 1870 because a FreeBMD death record was located for a George James Butler who died, aged 71, in the quarter ending June 1870 in the Strand registration district (where the Covent Garden area is located). Earlier Strand death records were located with the name George Butler but no ages were provided.

Notes:

1. In "The New Langwill Index", Waterhouse lists Algernon Rose's "Talk with Bandsmen" (London, 1894; reprint ed., London: T. Bingham, 1996) as a secondary source for George Butler. I haven't yet had a chance to check out this work which, I'm hoping, might contain more information on George.

2. The Butler surname is Norman in origin and used to mean "wine steward". The name has the same root as the modern French "bouteille" meaning "bottle". The name was then extended to denote the chief servant of a household and, in the households of royalty and the most powerful nobility, a high-ranking officer concerned only nominally with the supply of wine. In Ireland most of the Butlers are descended from Theobald Fitzwalter, brother of the Archbishop of Canterbury, who was created Chief Butler of Ireland by Henry II in 1177. The huge territories he was granted were mainly in counties Tipperary, Limerick and Wicklow.