Chinese word 柠檬 for lemon 🍋 prbly derive frm Arabic Laymoon.
Song Dynasty poet Su Dongpo has a friend nicknamed 黎檬子, he later learned 黎檬子 is an actual fruit, grew abundantly on Hainan island. pronounce 黎檬 in Cantonese, you get Laymoon.

It’s probably not a native Chinese word because it has been transcribed into various Chinese characters such as 黎檬, 黎朦, 黎梦 to convey same sound.
Su Dongpo was exiled to Hainan Island in 1097AD. Arab/Persian merchants already active in South China Sea for centuries prior

Interestingly lemon 🍋 likely originated in southern China. But somehow its native name was replaced by a foreign loan word

3rd possibility is that Laymoon was originally frm a non-Sintic language in Southern China. Arab/Persian sailors and merchants picked up the name and the plant when they came to South China Sea in 7-8th century and spread it around the world.