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It's just a silly effective name to help you remember and familiarize yourself with the characters easily the West has their own way of doing it too which i'll demonstrate later, but for Chloe you look at her default design you see the killer whale them you think "Orca !" of for the Japanese "Sakamata" there's no way you don't miss her surname (polite to use 1st in Japanese) even if you forget her given name "Chloe" that's okay.
I'd be willing to bet most people on /vt/ can at least name the 54 hololive girls partially or 100% based on image alone even someone not familiar with Hololive can look at Okayu get a hint that she's a cat and say "nekogirl purple or riceball" because of her design. The West wants people to remember names too but they use alliteration think of all the Marvel and DC superheroes that have it: Peter Parker, Bruce Banner, Clark Kent, Wally West
Kinda wish they did that a bit more with ID instead of just giving up after Risu and Moona or at least let them have Traditional ID sounding names.