We know who Jax was!

“Easy, Axa,” said Saijax Cail-Rynx Kohari Icath’un, popping a freshly shelled egg into his mouth. “She’ll be waiting for you when this day is done.”

https://universe.leagueoflegends.com/en_US/story/where-icathia-once-stood/

As a former Jax main, and he still being one of my favorite champions, this really excites me