Blåtand

Born circa 940 A.D., Harald Blåtand (Bluetooth) II was King of Denmark Gormsson, the son of Gorm "the Old" King of Norway. Harald inherited his father's kingdom, centered on Jelling in Jutland, and, as king, is famous for consolidating the Danish realm as a unitary kingdom – much in the same way the Bluetooth Consortium hopes to unify wireless connectivity.
Harald Bluetooth introduced Christianity into Denmark, and he had the famous Jelling rune stone erected in his parents' memory. The runic inscription on the other side of the big stone is his short biography: that he ruled Denmark, conquered Norway, and made the Danes Christians.
Harald Bluetooth was killed around 986 A.D. in battle against his son, Svend Forkbeard. His remains were buried in the cathedral at Roeskilde, where his bones are still preserved, walled up in one of the pillars of the choir.
Somebody from Ericsson in Sweden was very stoned one rainy September evening in 1998, when the name for the new technology was proposed.
Long life to the King Bluetooth!