Disappointed in one Endwalker Aspect [SPOILERS]

[Lyth]

...

Everyone chose to walk their respective paths. When you get down to it, Temple Knight A might just be starting their first day on the job, with a family to feed. Perhaps they look after stray cats in their free time and mind an elderly neighbor. They never caused any harm to anyone. And then wham, Azem shows up out of nowhere and kills them. Did they have any choice about how their path ended? 'So many broken by this world, then by you.' You can apply this line of reasoning to pretty much anyone that you dislike in game. Except for maybe Zenos, who would school you with it like he did Jullus.

It's actually Urianger who puts forward the idea that there's a connection between Azem, Azeyma, keeper of the Sun, and Azim, the Dawn Father. The glyph on the Azem soul crystal is the symbol for the sun.

As for the twelve, while there may be a link with the Convocation, most of them stayed within the walls of Amaurot. I'm more inclined to suspect that there's a connection with Radz-al-Han's Tales of the Braves (not to be confused with the Ivalice version):
'In an era long since ended
When chaos reigned o'er all the land
Did valiant souls take up the fight
To bring forth Light and cast out Dark
They numbered Twelve, no more nor less.'[1]

I haven't gone through the Relic weapons lore yet to see which ones are accounted for; it may be that we have ten names from the original relics and Azeyma and Menphina are the two unaccounted for. But who knows.