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 Minas Tirith Evening-Star Vol.8, No.2. Variant spellings in different works are: Denis, Dennis, Denys, David, Gueroult, Gerrolt, Gerroult.