Where does “cabarú” come from?

cabarú (Karirí) comes from Old Tupi kabaru, from Portuguese cavalo, from Old Portuguese cavalo, from Late Latin caballus, from Latin caballus, from Proto-Celtic kaballos — horse.

Ancestry of “cabarú”, step by step

Step	Language	Word	Meaning
1	Old Tupi	kabaru	horse (Equus ferus caballus)
2	Portuguese	cavalo	horse; a coarse, rude man; knight
3	Old Portuguese	cavalo	horse
4	Late Latin	caballus	horse
5	Latin	caballus	horse; nag; pack-horse, jade, hack
6	Proto-Celtic	kaballos	horse

Every word from Proto-Celtic kaballos →Every word from Latin caballus →Every word from Late Latin caballus →