Where does “Negros Oriental” come from?

Negros Oriental (Spanish) comes from Spanish oriental, from Latin orientālis, from Latin oriēns, from Latin orior, from Proto-Indo-European h₃ér- — to move, to stir.

Ancestry of “Negros Oriental”, step by step

Negros Oriental traces back through two separate lines of ancestry.

via Spanish oriental

StepLanguageWordMeaning
1Spanishorientaleastern; Oriental; Uruguayan
2Latinorientālisof the east, eastern
3Latinoriēnsrising
4LatinoriorI rise, get up; I appear, become visible; I am...
5Proto-Indo-Europeanh₃ér-to move, to stir

via Spanish Negros

StepLanguageWordMeaning
1SpanishNegros
Every word from Proto-Indo-European h₃ér-Every word from Latin oriorEvery word from Latin oriēns