Cha is tea in Chinese. I assume this is Indian naming is mentioned as a carryover from Chinese.
Southern Chinese (Min Nan, etc) call it Teh which became tea etc.
You can see that coastal nations got their tea from the seafaring southern regions whereas much of Central Asia, North Africa, and Eastern Europe got it from the northerners via the Silk Road.
https://www.reddit.com/r/etymologymaps/comments/g4bmh3/chai_...