It's entirely possible that "Dracon" was first attributed to the weapon by the yeerks - it being their own "invention" developed from the Andalite shredder and other lesser known alien weapons. And since they did have their own language, it might be a yeerkish word, but I for the life of me can't imagine where the yeerks came up with that on their own.
I think it much more likely that they took an alien word to apply to the weapon.
Aaaand this entire post has been completely off topic, so I apologize, Fwahm.
So, I think that "Pool" and "mother" were siphoned from the Andalites, and possibly the Gedds.
- Ha! Totally not all off topic!