The word "Caisi" is an Irish name that is typically spelled as "Cáit" in Irish Gaelic. The correct pronunciation of the name is Kah-tch, with a strong emphasis on the first syllable. The "ái" diphthong is pronounced as a long "a" sound followed by a slight "ee" sound. The letter "t" is pronounced with a slight "ch" sound as it follows the vowel "á". It is important to note that the spelling of the name can vary depending on the region and dialect of Irish Gaelic.