1930s; earliest use found in ‘Christopher Caudwell’ (1907–1937), writer (real name Christopher Sprigg). From the name of William Godwin + -ist, after Godwinism.
Definition of Godwinist in US English:
Godwinist
nounˈɡɒdwɪnɪst
rare
= Godwinian.
Origin
1930s; earliest use found in ‘Christopher Caudwell’ (1907–1937), writer (real name Christopher Sprigg). From the name of William Godwin + -ist, after Godwinism.