Theydon Garnon
The name Theydon Garnon comes from  the family of Gernon.  'Theydon Garnon: Introduction', A History of the County of Essex: Volume 4: Ongar Hundred (1956), pp. 258-262. URL: http://www.british-history.ac.uk/report.aspx?compid=15703  Date accessed: 25 December 2012. Theydon Garnon was listed in the Domesday Book as Taindena / Teidana, along with Theydon Bois and Theydon Mount.