I googled Jelkes. It seems to be a Dutch name. One link was about Dion Fortune's "The Goat-Foot God", which had a character called Mr. Jelkes, the owner of an occult bookshop who was trying to set up a centre for occult studies in an abandoned monastery. Dion Fortune was a novelist and writer on occultism in the 1920s and 1930s. I don't know if that helps.

Bingley


Bingley