The spelling of the word "Babesii" can be confusing, but it follows the rules of phonetics. The first two letters, "Ba," are pronounced with a short "a" sound, as in "bat." The following letters, "be," are pronounced with a long "e" sound, as in "bee." The final letters, "sii," are pronounced with a long "i" sound, as in "eye." So, the correct pronunciation would be "ba-be-sigh" with stress on the last syllable.