I wasn’t immediately settled on the name for the little elephant. I did eventually go with a literal name : Zōchii 象(ぞう)ちい lit. “Little elephant”. In English the long o is implied and the longer i just looks funny.
I tried things like “zoko” 象子 “elephant child” but it sounds funny in English.
I tried all three: “zokochii” 象こちお little elephant child, but it’s redundant and again in English looks funny. And I don’t think it actually works in Japanese either.
“Zōchi” is cute in English and Japanese, so I stuck with it.