What is the origin of the expressions "half-Nelson" and "full-Nelson?"

A nelson hold (sometimes simply referred to as a nelson) is a grappling hold which is executed from the backside of the opponent.

https://en.wikipedia.org/wiki/Full-Nelson#Full_nelson

A half Nelson is a wrestling hold in which the holder wraps his or her forearm under his or her opponent's underarm and rests his or her hand behind the nape of the held person's (his or her) neck. A full Nelson hold is two half Nelsons: neck held down with arms wrapped under both armpits of the held person


http://www.plexoft.com/SBF/F06.html

The term "nelson" is derived from "full nelson", which dates back to the early 19th century. It is supposedly named after the British war-hero Admiral Horatio Nelson, who used strategies based on surrounding the opponent to win the Battle of the Nile and the Battle of Trafalgar. But its true origin remains unknown.[1]

https://en.wikipedia.org/wiki/Full-Nelson#Full_nelson

Editor, please delete my earlier post as it did not answer the question.