Those weren't the characters or the term, but I'll track them down eventually.

Typically, the inheritor of a system is the Jeung Mun Yan, or Gatekeeper while the founder of a system is the Jongsi (Founding Teacher).

These are both horribly abused, as well of course, though sometimes in a comical way. I remember back in the day on rec.martial.arts a guy kept marketing himself as the super secret inheritor of some deadly other system, but called himself Jongsi [X], which actually meant he was the founder, or the person who made it up, which is what pretty much what we all assumed from the zaniness of his statements.