The name Bluetooth comes from the first Christian king of Denmark, also know as king bluetooth for having really bad teeth. https://en.wikipedia.org/wiki/Harald_Bluetooth
The Bluetooth wireless specification design was named after the king in 1997,[24] based on an analogy that the technology would unite devices the way Harald Bluetooth united the tribes of Denmark into a single kingdom.[25][26][27] The Bluetooth logo consists of a Younger futhark bindrune for his initials, H (ᚼ) and B (ᛒ).