I’m just a dabbler rather than an expert in Chinese, but…
I suspect the second name listed above is the old school name. It doesn’t seem to derive from non-Chinese usage and it is the official name on the Chinese wikipedia page. “Macaque Peach.” Maybe monkeys love the fruit (that’s likely regardless of etymology) or people decided that this was a peach that had hair like a monkey.
ETA: Just checked with a friend and yes, 猕猴桃 (Míhóutáo) is the original word. He has no idea about the etymology.
