Where does “ឝូន្យ” come from?

ឝូន្យ (Old Khmer) comes from Sanskrit शून्य, from Proto-Indo-European ḱówH-.

Ancestry of “ឝូន្យ”, step by step

Step	Language	Word	Meaning
1	Sanskrit	शून्य	zero; cipher, cypher; blank, deserted
2	Proto-Indo-European	ḱówH-	—

ឝូន្យ — Etymology, Origin & Word History | Etymology Explorer