That's wonderful.
Interesting to see him affect the hyphenated form of his given names Maurice Louis. I have for donkey's years always used the Maurice-Louis form. It could be argued it just appears rather more classy - which after deeper digging through this summer I suspect is the reason why he adopted it.
So what has convinced me he merely adopted it?
Unlike, for example, the more commonly hyphenated Jean-Pierres of this world, no official public records of Branger that I have viewed include in his case a hyphen between Maurice and Louis - not his birth record, nor marriage certificate, nor divorce paperwork etc. These contemporary references all read 'Maurice Louis'. So in the volume soon to be published including a selection of his motor racing photography we use 'Maurice Louis' - unhyphenated - while up-front we point out the alternative and explain why we have done so.
In contrast similar official French register records for the likes of Jean-Pierre Beltoise do feature a hyphen. Against this background we have in Branger's case been confronted by a choice and I opted to be pedantic.
If anybody wants to see his hyphen restored to him, I find that a tiny stroke of pen on page usually does the job.
DCN