Hi Bruce,
If you go to
www.ww2talk.com then go to the Vehicle Name and Census Numbers tab, within the wording under that header is a direct link to PDF file. The names and numbers of Pre WWII, WWII and Post WWII were compiled by Dick Taylor and myself. You should find the answers to your question and you will see that there were not just Daimlers at Dieppe and the regiments you mention who named their vehicles.
I hope it is of interest to you.
Cheers
Kevin