Also wasn't aware that Bridgestone, Sharp, or Olympus were Japanese, but those don't feel as revelatory as finding out about 7-11.
Sharp and Olympus I knew and missed Olympus... Bridgestone I was surprised too!
I missed some very obvious such as Toshiba, Mazda, Subaru, and Yamaha.
Not as of June 2018.
I'm surprised to not find Hitachi on this list.