"Beistyn" is a word from the Manx language which is spoken on the Isle of Man. The pronunciation of the word is "beɪʃtin" with the letter "y" representing the sound of "ʃ" as in "sh". The spelling of "eistyn" is used in some sources and is pronounced as "estin" with the letter "ei" representing the sound of "ɛ" as in "bed". This proves that spelling can vary depending on the source and the dialect used in a language.