The spelling of the word "Ayeisa" can be explained using the International Phonetic Alphabet (IPA) transcription. The first sound is the vowel sound "aɪ," which is a combination of the sounds "ah" and "ee." The second sound is the consonant sound "s," which is pronounced as "ess." Finally, the word ends with the vowel sound "a," pronounced as "ah." In terms of spelling, the "aɪ" sound is represented by the letters "a" and "i" together, while the "s" and "a" sounds are spelled traditionally.