Bluetooth technology got its name from a 10th-century king, King Harald Gormsson (Bluetooth).
The name dates back more than a millennia to King Harald "Bluetooth" Gormsson who was well known for two things;
*Uniting Denmark and Norway in 958.
*His dead tooth, which was a dark blue/grey color, and earned him the nickname Bluetooth.
In 1996, three industry leaders, Intel, Ericsson, and Nokia, met to plan the standardization of this short-range radio technology to support connectivity and collaboration between different products and industries.
During this meeting, Jim Kardach from Intel suggested Bluetooth as a temporary code name. Kardach was later quoted as saying, "King Harald Bluetooth…was famous for uniting Scandinavia just as we intended to unite the PC and cellular industries with a short-range wireless link."
Bluetooth was only intended as a placeholder until marketing could come up with something really cool.