There have been multiple proposed etymologies for the judo throw kawazu-gake (河津掛):
- Named after a famed sumo wrestler, Kawazu Saburo Sukeyasu
- Named after "frog" (蛙 old japanese kawazu, modern japanese kaeru), and the kanji getting confused along the line
Which (if any) of these is the true origin of the throw's name?
... famous as Kawazu used a new sumo hold wrapping a foot around his opponent’s leg and encircling the neck with one arm, a manoeuvre that became known as the Kawazu hold. The event took place in 1176 before Shogun Minamoto Yoritomo where Kawazu defeats the popular bully Matano.
There are many theories concerning the origin of the name of this technique. One of the most interesting is that the name of another technique - kawazu-gake (frog-entanglement) - was misused, because the pronunciation is the same. The 12th century Choju giga (Scrolls of the Frolicking Animals) contains a picture of a rabbit and a frog wrestling. The frog in this picture is actually applying kosoto-gake.
- Kodokan Judo Throwing Techniques (p.284)