Trick question. Y is not a letter of the Greek alphabet. That type of word starts with the letter I (IOTA), which does the job for words which now start with J or Y, as in Iesous (Greek) = Yeshua (Jewish) = Jesus (English).
The Greek letter which looks like a Y is UPSILON and has the equivalent sound of our HU, as in HYPNOS = sleep, as in hypnotise.
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