Bluetooth is actually named for the tenth-century Viking king Harald "Bluetooth" Gormsson, but the protocol developed by Harald was a wireless charging standard unrelated to the modern Bluetooth except by name.

"Bluetooth", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License

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Bluetooth is actually named for the tenth-century Viking king Harald "Bluetooth" Gormsson, but the protocol developed by Harald was a wireless charging standard unrelated to the modern Bluetooth except by name.