He was the only son of Thomas Somerville and his wife Sarah King, daughter of James King. In 1729, Somerville entered the Irish House of Commons as Member of Parliament for Dublin City, representing the constituency until his death in 1748. In 1736, he was appointed Lord Mayor of Dublin. On 14 February 1748, only months before his death, he was created a Baronet of Somerville, in the County of Meath.
On 2 February 1713, he married Elizabeth Quayle, daughter of James Quayle. Somerville was succeeded in the baronetcy by his eldest son Quaile. His second son, Major William Somerville, was buried at St. Audoen's Church, Dublin.
- "Leigh Rayment - Baronetage". Retrieved 12 June 2009.
- Burke, John (1832). A Genealogical and Heraldic History of the Peerage and Baronetage of the British Empire. vol. II (4th ed.). London: Henry Colburn and Richard Bentley. pp. 463–464.
- "Leigh Rayment - Irish House of Commons 1692-1800". Retrieved 12 June 2009.
- Haydn, Joseph (1851). The Book of Dignities: Containing Rolls of the Official Personages of the British Empire. London: Longman, Brown, Green and Longman's. pp. 461.
- "No. 8749". The London Gazette. 28 May 1748. p. 1.
- "ThePeerage". Retrieved 21 February 2007.
|Parliament of Ireland|
| Member of Parliament for Dublin City
With: Samuel Burton 1729–1733
Humphrey French 1733–1737
Nathaniel Pearson 1737–1748
Sir Samuel Cooke, 1st Bt
|Baronetage of Ireland|
|New creation|| Baronet
February – August 1748
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