The word "Nainsey" is spelled using the International Phonetic Alphabet (IPA) as [neɪnsi]. This phonetic transcription represents the sounds of the English language as they are pronounced. The initial sound "neɪ" represents the diphthong sound of "ay," followed by the consonant sound "n." The next syllable is "si," which starts with the consonant sound "s" and ends with the vowel sound "i." The spelling of the word "Nainsey" follows these sounds accordingly.