Only name I am aware of is "The Universe", prosaic as that might be. It's not like we have other universes to differentiate from, other than the theoretical ones.
Mayhap you are thinking of the "delta quadrant" from one of the Star Trek spin-offs.
I remember reading something about it from Parallel Worlds (A Journey Through Creation, Higher Dimensions, and the Future of the Cosmos by Michio Kaku...
I would take things that Michio says with a pinch of salt, he's become a bit sensationalist and out of touch with core physics. His job is to bend the truth to capture the attention of his audience, he seems to have done that well
There is no "outside" for our universe, due to space-time.
So we can only know of the universe we live in.
Our universe already has a name : UNIVERSE !
The term Universe is meant to define everything that exists in space, therefore the universe has no name because there is not another universe.
dont know if this will quote the disagree but jolike1... if you have some evidence that "experts beleive there are multiple universes" please share it as i would be interested to read that