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That’s actually pretty common too. Just off the top of my head: Cleanex, Xerox and Nintendo have all had to do similar things to protect their trademark.
Escalator was once a brand name.
They really started padding it towards the end to get to 50 but the first half or so of this listicle has a lot of good examples, quite a few that I didn’t know
https://www.impactplus.com/blog/50-everyday-words-that-started-as-brands-and-trademarks
