Where does “ဟံသာဝတဳ” come from?

ဟံသာဝတဳ (Mon) comes from Pali ဟံသော, from Pali haṃsāvatī.

Ancestry of “ဟံသာဝတဳ”, step by step

Step	Language	Word	Meaning
1	Pali	ဟံသော	—
2	Pali	haṃsāvatī	—

ဟံသာဝတဳ — Etymology, Origin & Word History | Etymology Explorer