The English word head has its unlikely origins in the Proto-Indo-European word kaput. Somehow, as kaput made its centuries-long voyage through German, Dutch, Saxon and/or Frisian to Old English, it morphed to heafod. From Old English it moved into Middle & Modern English, where it managed to drop a syllable & become head.
Along the way it collected dozens of idioms, including:
1200s – head count (applied to people)
1300s – headwaters
1300s – headstrong
1500s – head count (applied to cattle)
1680s – head of a coin
1680s – head on a mug of bear
1748 – head on a ship (toilet)
1911 – hophead, which became in time, pothead
1952 – heads up
1972 – head game
1984 – headbanger
& dozens more.
Because head has changed so much since it started out as kaput, it has a steaming heap of unlikely cousins, all from that same Proto-Indo-European root. Here is a sampling:
capital caput madcap
cabbage capo chief
scalp cap capsize
chef captain cob
achieve capillary cadet
decapitate cape cephalic
mischief precipice handkerchief
corporal chieftain capitulate
Many connections to the head are obvious. Others, not so much. Might any of you have a hare-brained theory as to how some of these words are related to the head? Please leave your thoughts in the comments section.