Everything I see has a "uni" wordmark for the pencil company. However, AIUI mitsubishi more or less means "three rhombi" -- the companies are both named after the same family crest.
I felt like kind of a numbskull when I made the observation that "Asahi" must be a similarly diversified company (Asahi Pentax cameras, Asahi beer) and was informed that "Asahi" means morning or rising sun by some patient soul.
It happens everywhere: Ford's Theater (Washington DC) is not related to the Ford Theater (Utah); similarly unrelated to Ford Motor Company, Ford Instrument Company, or Ford Meter Box Company.
> Their Boxy eraser is amazing...Anyone know of a better one?
Erasers continue to improve. One of the newer foam erasers, such as from Sakura, will probably perform better. There are many informative customer reviews at JetPens. Check out this sampler of their most recommended erasers: https://www.jetpens.com/JetPens-Eraser-Sampler/pd/19499