Sun Boy's real name is Dirk Morgna.
Colossal Boy's real name is Gim Allon.
The real name of Star Boy (or Starman) is Thom Kallor.
Jo Nah
Reep Daggle
Bouncing Boy's real name is Charles Foster (Chuck) Taine.
Cosmic Boy's secret identity is Rokk Krinn.
Shmuel was the name given to the character. The book was not based on a real incident, the character was not named for a real person.
Gim Allon is known in the comics as Leviathan, or Micro Lad, but most commonly he is known as Colossal Boy.
Brek Bannin. After being rejected by the Legion of Super-Heroes for not being able to control his ice-based powers, Brek Bannin founded and led the Legion of Substitute Heroes for years, before earning his place in the Legion. He first appeared in Adventure Comics #306
Thom Kallor is known as Starman or Star Boy in the comics. He has the power to increase the mass, density or gravity of an object.
Jo Nah is "Ultra Boy" of the Legion of Super-Heroes.
Luornu Durgo was a triplet-morphing character from the planet Cargg and a member of the Legion of Super-Heroes (LSH). After one of her bodies was killed by Computo, she became Duo Damsel. In the first incarnation of the LSH, she married the character Bouncing Boy, Chuck Taine, becoming Luornu Durgo Taine.