Meh. Languages evolve - Kannexian could be a local dialect of a pre-existing language, or a new language in and of itself. The distinction between the two is blurry anyway IRL, based largely on political grounds and not linguistic ones.
Btw, Syrixia, I thought of a scenario that might make sense for your language - perhaps, long long ago, people in the area now known as Syrixia spoke a large number of local languages, some similar and others very different. Modern Syrixian became the national language because, as it was unifying and becoming an empire, the elites/ruling family/whatever came from the small village that spoke that language, and not any of the other small villages that spoke other languages. This would explain SR's Vietnamese-based tongue - it simply didn't unify, and kept the original local language. This is very similar to RL India, which contained a huge number of small languages of which several but not all still remain alive today, but where the official national language is Hindi.