I recall kids using Atari or Ataris for video games in general. I’m sure Nintendo superseded that at some point.
I also remember a flyer or something where the Lego corporation tried to correct people who called their product Legos.

My pet peeve is how people use film to describe shooting something with a digital device.
I blame that on a teacher back in college who fumed if you said you were filming when you were actually shooting on videotape. He was secure in his belief video could never replace film and mocked early attempts at shooting movies in High Definition video.