The spelling of the word "smythies" is a bit tricky. The correct pronunciation is /ˈsmɪðiz/ with a voiced "th" sound. The "y" in the middle represents an archaic spelling of the letter "i". The final "es" is added to indicate the plural form. "Smythies" is actually a surname and originates from the Old English term "smitan," meaning "to strike." While it may be an uncommon word, it's important to know how to spell and pronounce it correctly.