Where does “Abaíra” come from?

Abaíra (Portuguese) comes from Old Tupi abá, from Proto-Tupi-Guarani *aβa — man.

Ancestry of “Abaíra”, step by step

Step	Language	Word	Meaning
1	Old Tupi	abá	man, especially a Brazilian male Indian; person;...
2	Proto-Tupi-Guarani	*aβa	man