Where does “ꦧꦧꦸ” come from?

ꦧꦧꦸ (Javanese) comes from Kawi babu, from Proto-Mon-Khmer (ʔ)boʔ — mother.

Ancestry of “ꦧꦧꦸ”, step by step

Step	Language	Word	Meaning
1	Kawi	babu	—
2	Proto-Mon-Khmer	(ʔ)boʔ	mother

ꦧꦧꦸ — Etymology, Origin & Word History | Etymology Explorer