proper noun/luˈθon/
Luzon (the largest island of the Philippines); Luzón (a tiny town and municipality of Guadalajara, Castilla-La Mancha, with less than 100 inhabitants)
From Classical Tagalog ᜎᜓᜐᜓᜅ᜔ (lusong, “old name for the Pasig River Delta in between medieval Maynila & Tondo”), probably through Portuguese Luçon, ultimately from Tagalog lusong.