It very well could! But it'd be convenient for us if the mountains were named after the mother of the First Brood, since she's also MIA in the story.
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That's if there actually is a mother. Gods and immortal creatures like Midgardsormr are often capable of asexual procreation. He was able to create himself a new body using nothing but aether; what's to stop him making children the same way?
I do think having a mother of the First Brood would be more interesting for the story, but there doesn't necessarily have to be one.
As far as we know, Abalathia could be anything. But since Abalathia has a spine and only vertebrates and books have spines, we assume that Abalathia is not just a made up fantasy geographic name like Aldenard and Vylbrand, but actually a historical or mythological figure.
Watch one of the book bosses in the Sharlayan Library be called Abalathia, just for that.
As soon as I heard the name Abalathia's Spine, it made me think of that curious landscape feature in Meriphataud Mountains in FFXI. Which happens to be called Drogaroga's Spine, although in this latter case, it is - apparently anyway - literally a spine. According to the very long quest line where your character has to run around Vanadiel searching for various monuments, Drogaroga was a giant dragon ... Coincidence? I wonder ...