First and foremost, I don't know the answer to this question - but I'd be interested to know why sportscar racing, in particular, has had so many incognito drivers in it's history.
It's not such a phenomenon these days, but historically, cryptic names and psudonyms adopted by some drivers was quite common - the likes of 'Beurlys', 'Gedehem', 'Anselme', 'Ted', 'Leveigh' and latterly, 'John Winter'.
What was the reason for this anonymity? Did they tell the missus they were just nipping out for a paper on Friday morning - and then not returning till Monday (or ever, in Leveigh's case)? Anyone know?
Also is Herr Jost and Herr Joest the same person?