I wanted Teddy to be Captain Marvel and share that with Carol, buuuut that's unlikely to happen, so:
It's what I've been saying. It's catchy/commercial enough, and I think it's a good alternative for Captain Marvel.
Teddy is different enough from Kamala to not create any confusion. And they can always give him more Kree-related powers like his siblings had to make him even more different from her. Design also makes a big difference, and Teddy would certainly have a more cosmic look than Kamala. Plus, Ms. Marvel was already a derivative name, and I don't mean just because of Captain Marvel, but also because the Mister Marvel name actually predates Ms. Marvel in the Marvel Universe. Funnily enough, it predates even the Captain Marvel name! Now I'm not saying Teddy should be honoring the random thug who used this name once, but... there's a precedent, it's all I'm saying.