Wei Wuxian had made an attempt at pronouncing Aziraphale, and Aziraphale had in return, given him the name he'd used while in China, with Chinese phonemes. He doesn't hear Lan Wangji struggle with it, so he offers no alternative.

"Wangji. Well, that should be easy to remember. It's nice to meet you, Wangji." He offers instead, a smile, and some commiseration. "If you do find a way to unseal your abilities, do let me know please. It just... feels wrong, as I'm sure you know. Empty."