The name of the letter was originally just "υ" (y; also called hy, hence "hyoid", meaning "shaped like the letter υ"), but the name changed to "υ ψιλόν" u psilon 'plain υ' to distinguish it from οι, which had come to have the sa… See more

In early Attic Greek (6th century BCE), it was pronounced [u] (a close back rounded vowel like the English "long o͞o"). In Classical Greek, it was pronounced [y] (a close front rounded vowel), at least until 1030. In Modern Gr… See more

The usage of Y in Latin dates back to the first century BC. It was used to transcribe loanwords from Greek, so it was not a native sound of Latin and was usually pronounced /u/ or /i/. The latter pronunciati… See more