The problem with Appa is he appeared in the Bronze Age a lot, but given the Pre-Crisis Guardians' thing about not having names, he prolly just went by Old-Timer for so long. I've gotta guess they named him somewhere around the time the Corps broke up, but can't say for sure. Given Ganthet's prominence in the GL mythos following his introduction, it's not uncommon for readers to assume he was Old-Timer.