John Jeffreys1 
He graduated from Oxford University, Oxford, Oxfordshire, England, with a Master of Arts (M.A.)1 He lived at Lincoln’s Inn Fields, London, England.1
Child of John Jeffreys and Elizabeth Darell
- John Jeffreys+2 b. 10 Aug 1718, d. 20 Nov 1798
Edward Darell1
Child of Edward Darell
- Elizabeth Darell+2 d. 1741
Elizabeth Darell1 
From 1711, her married name became Jeffreys.
Child of Elizabeth Darell and John Jeffreys
- John Jeffreys+2 b. 10 Aug 1718, d. 20 Nov 1798
John Jeffreys1 
He held the office of Canon Resident of St. Paul’s.1 He graduated with a Doctor of Divinity (D.D.)1 He held the office of Canon Resident of Christ Church, Oxford.1 He was Rector Gt Berkhamsted between 1756 and 1798 at Great Berkhamsted, Hertfordshire, England.1
Child of John Jeffreys and Elizabeth Darell
- Reverend John Jeffreys+2 b. 9 Jan 1771, d. 6 Jun 1840
Robert Darell1
Child of Robert Darell
- Elizabeth Darell+2 d. 16 Mar 1805
Elizabeth Darell1 
From 2 June 1761, her married name became Jeffreys.
Child of Elizabeth Darell and John Jeffreys
- Reverend John Jeffreys+2 b. 9 Jan 1771, d. 6 Jun 1840
Captain Richard Byron1
Child of Captain Richard Byron
- Charlotte Byron+2 d. 19 May 1858
Charlotte Byron1 
From 21 January 1796, her married name became Jeffreys.
Children of Charlotte Byron and Reverend John Jeffreys
- Edmund Richard Jeffreys2
- Charlotte Elizabeth Jeffreys2 b. 4 Nov 1796, d. 10 Mar 1873
- Elizabeth Mary Jeffreys2 b. 12 May 1798, d. 22 Jan 1872
- Caroline Jeffreys2 b. 20 Aug 1799, d. 20 Aug 1871
- Harriet Margaret Jeffreys2 b. 16 Oct 1800, d. 21 Feb 1877
- John Edward Jeffreys2 b. 25 Dec 1801, d. 22 Jun 1824
- Frederick Thomas Jeffreys2 b. 26 Mar 1803, d. 26 Feb 1824
- Lucy Anne Jeffreys+2 b. 24 Oct 1804, d. 14 Feb 1843
- Frances Jeffreys2 b. 17 Jan 1806, d. 28 Nov 1884
- Marmaduke Robert Jeffreys2 b. 4 May 1807, d. 10 Nov 1898
- Reverend Henry Anthony Jeffreys2 b. 28 May 1810, d. 23 Jun 1898
- Arthur Jeffreys+2 b. 1 Oct 1811, d. 13 Sep 1861
- Julia Jeffreys2 b. 1 Nov 1813, d. 8 Feb 1899
John Edward Jeffreys1 
Frederick Thomas Jeffreys1 
He gained the rank of Lieutenant in the Royal Navy.1
