Where does “Ilocos Sur” come from?

Ilocos Sur (Tagalog) comes from Tagalog sur, from Spanish sur, from French sud, from Middle French sud, from Old French sud, from Old English sūþ, from Proto-Germanic sunþrą, from Proto-Indo-European sóh₂wl̥ — sun.

Ancestry of “Ilocos Sur”, step by step

Ilocos Sur traces back through two separate lines of ancestry.

via Tagalog sur

StepLanguageWordMeaning
1Tagalogsursouth
2Spanishsursouth
3Frenchsudsouth
4Middle Frenchsudsouth
5Old Frenchsudsouth
6Old Englishsūþsouth
7Proto-Germanicsunþrąsouth; south, southward
8Proto-Indo-Europeansóh₂wl̥sun

via Tagalog Ilocos

StepLanguageWordMeaning
1TagalogIlocos—
Every word from Proto-Indo-European sóh₂wl̥ →Every word from Proto-Germanic sunþrą →Every word from Old English sūþ →