no joke ... This is why fishermen are referred to as anglers

Well, if serious, your etymology is quite simply wrong. Fishermen are called anglers because the Middle English verb for 'to fish' was angelen, and that verb came from the Old English noun for hook, as mentioned in this thread above. This predates the borrowing of Norman aungle, originally 'corner (of a room)' into Middle English. This French word goes back to roughly the same PIE root as the angle 'hook' word, but the routes these two words took is different. The angle is one in the hook, and not in the rod and line.

Ceci n'est pas un seing.