Where does “tai” come from?

tai (Translingual) comes from English tai, from Japanese 鯛, from Old Japanese たい.

Ancestry of “tai”, step by step

Step	Language	Word	Meaning
1	English	tai	A fish, the Japanese bream
2	Japanese	鯛	sea bream (fish of the family Sparidae); porgy
3	Old Japanese	たい	—