The correct spelling of the word "Kaysey" is actually "Casey". The pronunciation of this name can be represented in IPA phonetic transcription as /keɪsi/. The first syllable, "kay", is represented by the diphthong /keɪ/, which has the same sound as the word "kay" that means "okay". The second syllable, "sey", is represented by /si/, which has the same sound as the word "see". Therefore, the phonetic transcription of "Casey" is /keɪsi/.