Where does “Batangas” come from?

Batangas (Tagalog) comes from Spanish Batangas, from Spanish batanga, from Tagalog batang, from Proto-Malayo-Polynesian bataŋ.

Ancestry of “Batangas”, step by step

Step	Language	Word	Meaning
1	Spanish	Batangas	—
2	Spanish	batanga	—
3	Tagalog	batang	log
4	Proto-Malayo-Polynesian	bataŋ	—