The majority of all weapons throughout history are either converted tools or (more commonly) designs derived from tools. The exception is mainly spears, maces, and (if we don't count them as derived from knives) swords. Particularly polearms tend to just literally be a farm tool on a stick. Flails, bill hooks, war scythes, guisarmes and voulges, every nasty way to hook or chop somebody from afar, war hammers and war picks. In fact every weapon called a "war [tool name]" could with almost certainty be assumed to be such.
