cayo
/ˈkaʝo/ · B2 · noun · m
key
🏝️ cayo sounds like 'key-oh' — and a key is what an island chain is named for in English
Spanish cayo is the source of English 'key' in Florida Keys, via Taíno 'cayo' (small island). Say 'KAH-yo': the English 'key' in Key West is the same word, so cayo = key = small low island.