Origin of ilocano
- Spanish Ilócano from Ilocano Ilóko people who live along the shore (unattested sense), Austronesian people of the Philippines perhaps akin to luék, luók cove
From American Heritage Dictionary of the English Language, 5th Edition
- Philippine Spanish, from Iloco/Iloko, the native word for the inhabitants of Ilocos + the Spanish suffix -ano. Iloco comes from an old Ilocano prefix i-, meaning from, and either lukong, meaning flat lands, or luek/look, meaning bay. Some suggest that it comes from Tagalog ilog, meaning river, but this is highly dubious, for it goes against the customs in naming groups and places.