For some reason, I have been blissfully unaware of the origin of the name of the Bluetooth technology.

Bluetooth's name took inspiration from King Harald "Bluetooth" Gormsson. The implication was that Bluetooth was to unite communication similar to how King Harald united the clans of Denmark.

There are a couple of explanations as to the reason behind his nickname, the first being that he had a bad tooth that appeared dark in colour. The second being that he was named "blue thane" or "dark thane" in England and thegn being translated back as tan - hence, "Bluetooth".

The logo for Bluetooth is also apparently made up of runes of his initials H () and B ().

https://en.wikipedia.org/wiki/Bluetooth#Name

While not an overly long post today, I thought it was interesting. I'm also surprised I'd not read this before. Then again, it's very possible I have and completely forgot.