Where does “bà ngoại” come from?

bà ngoại (Vietnamese) comes from Vietnamese bà, from Chinese 爸, from Chinese 父, from Komodo paʔ, from Proto-Malayo-Polynesian əpat, from Proto-Austronesian Səpat — four.

bà ngoại (Vietnamese): maternal grandmother

Definitions

maternal grandmother

Ancestry of “bà ngoại”, step by step

bà ngoại traces back through two separate lines of ancestry.

via Vietnamese bà

Step	Language	Word	Meaning
1	Vietnamese	bà	a grandmother; an old woman; an old lady; you, my...
2	Chinese	爸	—
3	Chinese	父	—
4	Komodo	paʔ	four
5	Proto-Malayo-Polynesian	əpat	four
6	Proto-Austronesian	Səpat	four

via Vietnamese ngoại

Step	Language	Word	Meaning
1	Vietnamese	ngoại	Synonym of ngoài; foreign; related to the...
2	Middle Chinese	外	—

Every word from Proto-Austronesian Səpat →Every word from Proto-Malayo-Polynesian əpat →Every word from Komodo paʔ →