To me, and others the colour you originally saw as purple, many of rest of us saw more as blue ( albeit with a purplish tinge) so to us the fact that it was called blue was fine and not in any way surprising, but perhaps we also accepted that tartan colours are generally kept simple in terms of basic colour name.
Just as there is no accepted colour system for tartan colours, there is no accepted colour naming system, so anyone can name any colour whatever they want, and people who name colours on a paint chart constantly do, so the fact that the same colour exists on different systems but with differnt names, doesn't surprise me in the slightest.
Any artist or designer working with colour, do so in a slightly different way to each other, this is normal and natural, it's very much an organic and subjective process. I don't think it will ever be possible to make any system which will work across all substrates to make colour matching perfect,simply put the same colours on different substrates never look exactly the same.
I do understand what you are trying to get at, but I can't help feel that you are actually trying to square the circle, sorry but I think you would be so much better off looking at the actual samples, than comparing RGB/Hex/monitor/name codes!