Shu'ma and Go'rath are likely named after Shuma-Gorath from Marvel Comics. The Maw of Gor'ma seems to be these two names mashed together.
This article or section includes speculation, observations or opinions possibly supported by lore or by Blizzard officials. It should not be taken as representing official lore.
The Forgotten One from Warcraft III: The Frozen Throne due to its appearances and similarities, being an entity under the earth seeking to emerge, could be this type of creature, as Anub'arak called it "A forgotten one" and the name for these maw creatures could be "forgotten ones".