From; of a given place. The following place name designates the place of birth, or regular place of residence, of someone so described.
Hānan linalā'i ya iBannāwolda.
As for those men, they are from Banaue.
A variant iy- occurs when the place noun begins with a glottal stop. Glottal stop is dropped and the prefix is followed by a vowel.
i- + Umbūlu: iyUmbūlu