Mercedes is a Spanish female name, derived from María de las Mercedes (“Our Lady of Mercy” or “Mary of Mercies”), which is one of the Roman Catholic titles of the Virgin Mary.
Emil Jellinek was an Austrian-Jewish diplomat based in Nice who ran a profitable business selling cars, and, as a racing enthusiast, had been racing DMG automobiles under the pseudonym Mercédès, after his daughter, Mercédès Jellinek.[2] Later he contracted with DMG for a small series of dedicated sports cars containing an engine that officially bore his daughter’s name.
Mercedes was a name before being a car brand.
https://en.m.wikipedia.org/wiki/Mercedes_(name)
https://en.m.wikipedia.org/wiki/Mercedes_(car_brand)
And Isis was also a name before the terrorist organization. Sadly lexicons change over time.
(But that is a cool history)