>>62826869For Isegye, those are just their gamer names, it didn't have a debut standard flow. Like "Nocturnal", "Valkyrae" or "XQC".
The members that came to the audition kept the names they had already picked.
Airi Kanna and Ayatsuno Yuni specifically came from a different vtuber group, with the other graduated, big, space dog. Yumepercent being Japanese themed.
They might have just continued the naming scheme to fit those 2.