Unfortunately, no-one really knows the origin of the Miriam / Mary set of names, of which Mariah is one. Click here: Mary to see all of the currently available information.
See, this is why we need Devon backShe gave a mini-essay in which she explained why she believed "wished-for child" was likely the most accurate meaning for Mary.Unfortunately, she posted it on the Opinion Board, so it's lost. And I can't recall it either, not even the gist of it.Miranda