The spelling of the word "eisin" may seem unusual, but it is simply the Irish Gaelic word for "they are". The pronunciation of "eisin" is /ɛʃɪn/ with the stress on the first syllable. The use of the letter "s" with a dot above it (known as a "síneadh fada" in Irish) indicates a long "e" sound. Additionally, the combination of "eis" produces an "esh" sound. So, the word "eisin" sounds like "EH-shin" when spoken aloud.