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According to P. H. Reaney's Place-Names of Essex, the standard guide to etymology in the county, the name means 'Cicca's well', Cicca being an Anglo-Saxon personal name. In medieval sources the name appears with a wide variety of spellings including "Cinghe uuella" and Chikewelle". Folk etymology has sought to derive the name from a lost "king's well", supposed to have been to the south-east of the parish near the border of what is now the London Borough of Redbridge. There were several medicinal springs in Chigwell Row documented by Miller Christy in his book History of the mineral waters and medicinal springs of the county of Essex, published in 1910. The proposal by 18th-century local historian Nathaniel Salmon that the "-well" element in the name derives from Anglo-Saxon weald (forest), indicating Chigwell's location in a royal demesne rather than Anglo-Saxon wielle (well) has long been superseded by modern onomastic study and is no longer credible.

The land registration map of Redbridge Council shows "Chig Well (site of)" as being located to the rear of the house located at 67 Brocket Way, Chigwell.

From 1933 to 1958 there was an RAF presence located at Roding Valley Meadows (near what is now the David Lloyd Leisure Centre). It served first to provide barrage balloon protection during World War II and was involved in the rollout of Britain's coastal nuclear early warning system during the Cold War. In 1953 it briefly housed the RAF contingent taking part in the Coronation celebrations. Some of the RAF Chigwell site is now part of the Local Nature Reserve, Roding Valley Meadows LNR.