The Ezekiel choke in BJJ is named after Ezequiel Paraguassu, an olympic Judo fighter who studied with the Gracie BJJ family before the 1988 olympics to perfect his ground fighting. According to Jiu Jitsu Legacy, Paraguassu was frustrated by the tight closed guard of his new Brazilian friends until he remembered an old, rarely used judo choke called the Sode Guruma Jime, Japanese for sleeve wheel constriction. The choke was so effective and popular that it was named after him (albeit with a misspelling).
The Ezekiel choke uses the cross face position from mount, half guard, or even from inside someone’s guard to grip onto the free arm’s sleeve and use that sleeve to choke the opponent. This setup doesn’t require sacrificing your good position, so it’s a great submission to attempt even if your opponent defends it well.
Start: Mount
Step 1: Establish cross face behind opponent’s neck
Step 2: Grip attacking arm’s sleeve with four fingers of cross face hand
Step 3: Slide attacking hand under opponent’s chin and over their neck
Step 4: Pour weight onto your hands and into the choke
Finish: Submission via Ezekiel choke