I have no idea.
Probably a name that has to do with youth.
Probably not "Youth", because that is the name of their debut song.
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Maybe it would be CiTY, because of the initials. (but that gives me NCT vibes...)
But well... I used to stan Voisper, which was a group from the same company as Catch The Young, and their fandom name was "dolphin"...