Where does “ครึ่ง” come from?

ครึ่ง (Thai) comes from Proto-Tai ɡrɤŋᴮ — half.

ครึ่ง (Thai): half

Definitions

Step	Language	Word	Meaning
1	Proto-Tai	ɡrɤŋᴮ	half

ครึ่ง — Etymology, Origin & Word History | Etymology Explorer