>>32353154Astel talked about this. When Holostars debuted they followed the girls example of having generations, but by the third gen (Trinero/MaFia) they realized they had to change their approach and switched to debuting units. So under the Holostars branch you have the units Holostars, Uproar, and Tempus. He compared it to the Japanese boy band Johnnys, which went on to be a talent agency with more units.
While gen 1 had no name due to the early approach, Astel actually suggested a unit name for second gen but management told him it wasn't needed. Then Trinero debuted and he asked them what was up and they basically just told him "teehee why not" and to go ahead and come up with a name, which is why Suntempo's (Astel came up with the name) PV came long after their debut.