Eykyn was the son of Richard Eykyn of Crouch End, Middlesex, and Ackleton, Shropshire and his wife Susanna Starr, daughter of Sir William Starr, of Canterbury. He was a J.P. for Berkshire, and a cornet in the Royal Buckinghamshire Yeomanry Lancers.
In 1866 Eykyn was elected at a by-election as a Member of Parliament (MP) for Windsor after the return of the previous general election was declared void. He held the seat until his defeat at the 1874 general election.
Eykyn died at the age of 68.
Eykym married firstly Maria Prinald Schlotel, daughter of George Schlotel of Essex Lodge, Streatham, Surrey. She died in October 1866 and he married secondly in 1868, the Hon. Mary Caroline Mostyn, daughter of the 6th Baron Vaux of Harrowden.
- Leigh Rayment's Historical List of MPs – Constituencies beginning with "W" (part 4)[self-published source][better source needed]
- Debretts House of Commons and the Judicial Bench 1870
- Craig, F. W. S. (1989) . British parliamentary election results 1832–1885 (2nd ed.). Chichester: Parliamentary Research Services. p. 337. ISBN 0-900178-26-4.
- Hansard 1803–2005: contributions in Parliament by Roger Eykyn
|Parliament of the United Kingdom|
Sir Henry Ainslie Hoare, Bt
|Member of Parliament for Windsor
1866 – 1874
With: Charles Edwards to 1868
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