>>the name Bluetooth is derived from the English name of the Danish king Harald Bluebeard, who ruled in the 10th century.

You almost certainly mean Harald I (Harald Gormson). I've never heard of him being referred to as "bluebeard", and am a bit puzzled by it as he, as a Dane would most probably not have had a beard so dark it looked blue. Any idea how he might have acquired that name? I'd mention that his name in old Norse is Haraldr Blátǫnn Gormsson; 'Blátǫnn' translates as 'blue tooth' - so I find the name a bit surprising.

As a side note, English gets a quite a few words - and the removal of many gendered verb tenses thanks to the Danish take-over of parts of what's now England (the "Danelaw"). Having made a pass at learning German (that still includes those gendered tenses) I'm rather glad we don't have to deal with them. :-)

Yeah, non-technical and way off-topic to boot. Sorry 'bout that.