I'm both cackling at and side-eyeing Lan Qiren's name, since especially as their Lan is supposed to be from the word for temple, it's a much too apt name. Like, at least acknowledge the fact that the kid might do something other than teach, okay? (Or it was one of those aspirational "will become a model Confucian gentleman" names.)

I have wondered this about Lan Wangji and Lan Xichen. Shouldn't they have the same start? Or is it only the Jins that do this?
The Jins canonically have a generation poem, but the Lans (Xichen and Wangji) and Nies (Mingjue and Huaisang) don't, and if the Jiangs have one, they have separate ones for daughters and sons (Yanli and Wanyin). I'd guess that only the Jins have one. The three characters we know from it are 光子如.

What were her parents thinking??
Perhaps they were only semiliterate, or her name was misspelled by the Jins and then it became that instead of its original form? IDK.