So, I have gotten to the part of my retelling where Makuta takes over, and I "discovered" (having apparently never consciously noticed) that officially, he nicknames the MU the "Makutaverse" at that time. I like the idea of him naming it after himself, but Makutaverse sounds hopelessly silly. For one thing, it's a fusion of both English and Matoran.
I got to thinking, though -- what if I come up with a Matoran word for "universe", and mix THAT with Makuta?
Looking into the Maori, I found a word for realm that is similar to (my shortened version here) Taia. Makutaia sounds cool, and even evokes his old lair, the Mangaia.
Also, Taia is WAY more concise than "Matoran Universe" and also avoids the acronym which looks like a cow is yelling.
Or, longer version, Matoran Taia.
Likey no likey?