Bluetooth was developed by Ericsson (pre-Sony Ericsson) which is a major Swedish telecommunication company.
They named if after the Danish viking king, Harald Blåtand. Harald Blåtand was the king who converted from the belief in the Ancient Norse Gods and Goddesses to the single God of Christianity.Its created in earlier, to unite Norway and denmark.
Blåtand translated to English, literally means Bluetooth, so that’s how they came up with the name.
If you look at the Bluetooth symbol, there’s a Runic inscription in it. The two lines sticking out of the back of the B actually represent a Runic H. The B is, obviously, a Runic B. Harald Blåtand’s initials form the symbol of today’s world’s Bluetooth!