I don't know how trade-marks work, but Tesla is also just a name, isn't it? Maybe they just need to hire someone whose last name is Tesla and claim it was named after them haha.
The standards there are things like 'could one reasonably confuse your product or service with one provided by some other business, based on the names you're using' not 'do you have someone named Mercedes working in ops'.
As a user I find it mildly offensive. Elon himself probably would laugh it off. Not going to use this as I find the exploitation of the name kind of gross. Maybe in 100 years if he’s not around then fine... but for now it’s too soon.