The spelling of the word "stirrahs" might seem confusing, but it actually follows a specific pattern in the English language. The sound "st" is represented by the letter combination "st", while the "ir" sound is written as "i" followed by an "r". The last syllable is spelled "rahs" using the letter combination "ah" for the "a" sound and "s" for the "s" sound. Therefore, the correct pronunciation is /ˈstɜːrəz/. Keep in mind that irregular spellings like this can be tricky, so always double-check before using them in writing.