The word "Siusan" is a somewhat uncommon spelling of the name "Susan". It is pronounced /ˈsuːzən/ (soo-zuhn) in IPA phonetic transcription. The spelling likely originates from an alternative pronunciation or regional dialect, where the "s" sound is emphasized and the "a" sound may be clipped or nasalized. While unique spellings can add character to a name, they may also cause confusion or difficulty in pronunciation for those unfamiliar with the spelling.