The spelling of the word "Chelsei" is quite unique and may be confusing for some. It is pronounced as /tʃɛlsi/ with a soft "ch" sound, followed by "el" and ending with "sei." The letter "i" at the end is not emphasized in the pronunciation. It is important to note that this spelling is not commonly used and may be a variation of the name "Chelsea." When writing or pronouncing this word, it is best to clarify the intended meaning and pronunciation.