The naming scheme goes back to at least 2004 (Curie), and Wikipedia has done the service of alphabetizing it for us: https://en.m.wikipedia.org/wiki/List_of_eponyms_of_Nvidia_GP...
Also, it occurred to me that Nvidia does sometimes increment the die to 200 (EG GM200, as the Maxwell 100 series was a single small oddball die). Its possible that they "refreshed" the GH100 die and are codenaming it GH200.