Art in Swedish is "konst" which is the base for the word "konstig" which means, literally, weird or odd. I'm pretty sure there's a reason for that etymology.
in Danish Kunstig main meaning is artificial or synthetic, secondary meaning - does not seem real, natural, or authentic (of upright standing)
http://ordnet.dk/ddo/ordbog?query=kunstig
so I don't know that I would say there is a reason for the etymology that relates in any direct way with artists are weird.
so I don't know that I would say there is a reason for the etymology that relates in any direct way with artists are weird.