The spelling of the name "Sidni" is derived from the name "Sydney." The phonetic transcription for "Sidni" in IPA (International Phonetic Alphabet) is /ˈsɪdni/ - this includes the consonant cluster "dn" which is pronounced as one sound, similar to the double "n" in "canon." The letter "i" at the end of the name is pronounced as "ee," adding the long vowel sound of the "i". It is important to note that in some dialects, the name may be pronounced with a different emphasis, such as "SID-nee."