So, I've been reading a bunch of the old Superpets stories that DC reprinted in the Tails of the Superpets trade and I noticed something weird. We all know Supermonkey is named Beppo, right? Except, I can't find any instance Pre-Crisis of him actually being called that. It's just Supermonkey. Sure, there is a monkey named Beppo in his first appearance (Superboy #76), but that's an organ grinder's monkey. The earliest I can find him being called Beppo is from Who's Who's entry on the Legion of Superpets. Was this just a mistake that stuck?
EDIT: Earliest I've found is Superman #173 from November '64 in a short Green Kryptonite feature. I'm fairly certain this has to be it, which means it's the only Silver Age time he's called Beppo. Weird, I guess it must've been a mistake.