It's TM law, and it's why it's more complicated than just changing a name. A lot of people associate the name with the Jeep brand and the cost to the company to re-brand and re-introduce a new name that has the same level of customer awareness is top primo dollar. That's why corporations and entities fight this sort of thing. Jeep Grand Cherokee®, etc., etc.
If I know it, it's in the public consciousness because of repetitiveness. There's an actual accounting price on goodwill and name branding. Again, not so simple to just change a name. That's why Woz got a B and not an A, by the way.