Denys Gueroult
From Tolkien Gateway
Denys Gueroult made a recorded interview with J.R.R. Tolkien in January 1965, known as An Interview with J.R.R.T..
"Denys Gueroult" is the spelling used in The J.R.R. Tolkien Companion and Guide and Minas Tirith Evening-Star Vol.8, No.2. Variant spellings in different works are: Denis, Dennis, Denys, David, Gueroult, Gerrolt, Gerroult.