Where does “หงสาวดี” come from?

หงสาวดี (Thai) comes from Burmese ဟံသာဝတီ, from Mon ဟံသာဝတဳ, from Pali ဟံသော, from Pali haṃsāvatī.

Ancestry of “หงสาวดี”, step by step

Step	Language	Word	Meaning
1	Burmese	ဟံသာဝတီ	—
2	Mon	ဟံသာဝတဳ	—
3	Pali	ဟံသော	—
4	Pali	haṃsāvatī	—