Where does “ศิลา” come from?

ศิลา (Thai) comes from Sanskrit शिला, from Proto-Indo-Iranian *ćHláH.

ศิลา (Thai): rock; stone

Definitions

Step	Language	Word	Meaning
1	Sanskrit	शिला	stone, rock, crag; red arsenic; camphor
2	Proto-Indo-Iranian	*ćHláH	—

ศิลา — Etymology, Origin & Word History | Etymology Explorer