Learn how to say Nachos correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word nacho:
noun (plural nachos)
a small piece of tortilla, typically topped with melted cheese and spices.
perhaps from Mexican Spanish Nacho, pet form of Ignacio, given name of the chef credited with creation of the dish. An alternative derivation is from Spanish nacho ‘flat-nosed’
Make the plural of nacho (a Mexican Spanish word) in the usual way, by adding -s: (nachos).