The original ancestor of Y was the Semitic letter Waw, which was also the ultimate origin of the modern letters F, U, V, and W. See F for details. In Ancient Greek, Υψιλον (Upsilon) represented IPA: , then later on /y/ — close front rounded vowel. The Romans had already borrowed this as the letter V, to represent both the vowel /u/ as well as the consonant /w/, but in later times, because the pronunciation of Ypsilon in Greek had shifted to /y/, they borrowed it...