Where does “ʼaṃnāca” come from?

ʼaṃnāca (Old Khmer) comes from Old Khmer ʼāca.

Ancestry of “ʼaṃnāca”, step by step

Step	Language	Word	Meaning
1	Old Khmer	ʼāca	—

ʼaṃnāca — Etymology, Origin & Word History | Etymology Explorer