The word comes from a popular black name, the mater of whom copulated and have offspring with those migrating from Jerusalem. Jerushanel was born.
The Jerushanel was known as the richest black man, and the poorest jew.
During the holocaust, Jerushanels were known to lurk around the camps at night, because they knew their jewcraft and dark skin could masquerade themselves. No Jerushanels were harmed in the holocaust.