Where does “k-rɔːs” come from?

k-rɔːs (Proto-Vietic) comes from Proto-Mon-Khmer kruəs.

Ancestry of “k-rɔːs”, step by step

Step	Language	Word	Meaning
1	Proto-Mon-Khmer	kruəs	—

k-rɔːs — Etymology, Origin & Word History | Etymology Explorer