My only comment is that the car was actually called ss 100 Jaguar. SS= "swallow sidecars" was the name of the company before WWII. After the war the company was renamed to "Jaguar" to avoid bad associations.
Actually the SS 100 was made from 1936 to 1940 under the SS nameplate. Its successors were briefly called SS Jaguar. The name was changed to just Jaguar after World War Two for the reasons you mentioned.