Naming comes more often from the player who first played it or the player who first analysed it. The 1st person to publish analysis of it was Mark in 2008. That analysis covers every good response from black.
If some openings have several names, why shouldn't this one be called Mark's Opening aswell as whatever other name people come up with for it? And why 4 different names with Jobava in them, with no credit given to the player who first analysed it? And why not call it the Stefanova Opening? The problem with having more than 1 name is that it causes confusion; people don't know what opening you're talking about if you use a different name for it. So it makes more sense to use the name it was originally given. The name originally given to this opening is Mark's Opening.
All Stefanova and Jobava have done is built on the ideas already published by Mark.
Just to clear some confusion; opening names are not something you registrer for a copyright. Some openings even have several names.
The first official game i can find on this opening is in 1880'ish. Even Alekhine played it a few times in the 1930's. The idea is not novel in any way.
Naming usually comes from a Strong player bringing the opening out and using it for good results, or someone who greatly advances the theory on the certain line.
Being called Mark with 0 official highlevel games and 1 short blog-post does not cover either of this.
Jobava and Stefanova does. Even if they didn't truly use it until 2014.