I have seen in other threads proposals for the Noble to be the base class, with Warlord being a subclass. Other sub classes could be Mage Commander / War Mage and some sort of social / diplomat commander focusing on influene. I rather like this, what do others think?
'Noble' is a narrower concept, with a more definite/legitimate connotation of authority/social status, so it's worse in terms of objections to the name, and it's from SWSE rather than D&D, and there's already a Noble background.
So, not so much. Though, obviously, Noble could make a fine background for a Warlord if the player wanted to play something of the sort.
I have an even bigger problem with the name Noble than Warlord
It does have several strikes against it. It's already a Background. It strongly implies social position and legitimate authority. It has a clear IC meaning within the imagined world. It was also a class in a different WotC game, Star Wars SAGA edition, which is a plus (it was a pretty good class, with a similar schtick) & a minus (wrong game), really.
Warlord is really the best name, at least the best name that comes anything close to suggesting the tip of the iceberg of archetypes the class concept suggests while sounding appropriately fantasy-genre-esque (military ranks are even narrow, connote legitimate authority, and tend to sound more modern to our ears, since they're still in use). It's negative connotations are /less/ than those of existing classes, like the Warlock, or sub-classes like the Assassin, which made it in without a hint of complaint - the most nearly cogent complaint, the use of the term in the media to describe terrorist leaders is, ironically, equally applicable to the Cleric, used by the same media with equal frequency and greater scope to describe fatwa-issuing nominally-spiritual leaders of those same terrorists. Again, something which garnered not the least hint of controversy for that class.
And, as the Noble demonstrates, the name-space is crowded, not just with 5e classes & sub-classes & backgrounds, but with past-edition Classes, Kits, sub-Classes, and PrCs, bringing the risk of calling back something completely unrelated.
5e used the most recent past-edition name for every full class in the PH.
It should use Warlord for the Warlord.