hello botteville yes i suppose it is more or less a misunderstanding the things are quite complicated and there is another possibility for the origin of the latinized version carolus and i do not think it directly comes from kar i laz because carolus was borrowed from germanic when common germanic had already disappeared for a long time that is quite hypothetic and there is another possible etymology see for example this very well documented site i suppose carolus was borrowed from old high german or old franconian that is why i do not accept the very shortened statement kar i laz carolus i agree totally about carolus charles with some typical french phonetic shifts i know that the meaning of churl is different but it is the same etymological root ultimatly from kar i laz sure but through an intermediate west germanic form keril about disambig and so on you can arrange it the way you want to you can improve it the way you want to i am not able to make that regards