The spelling of the word "Sidney" is commonly mistaken with "Sideny". The correct pronunciation is /ˈsɪdni/, with stress on the first syllable. The letter "y" at the end is silent, making the phonetic transcription "ˈsɪdni". "Sidney" is a popular name and is also the name of a city in Australia. Therefore, it is important to use the correct spelling to avoid confusion and misunderstandings in communication.