Hmmm. I'm not sure Mr Mannn would fit anything.
Years ago there was a TV crime show called Mannnix. and another one called Mannnimal (about a guy with the power to turn into a trained Dog, a bird, and a snake).
Theres Mannnwich. But I can't see any way to get the MR into the name.
on the other hand, Mamacags could be Aunt Jemimah.