How to pronounce z in English

"Z the twenty-sixth and last letter of the English alphabet is a vocal consonant. It is taken from the Latin letter Z which came from the Greek alphabet this having it from a Semitic source. The ultimate origin is probably Egyptian. Etymologically it is most closely related to s y and j; as in glass glaze; E. yoke Gr. / L. yugum; E. zealous jealous. See Guide to Pronunciation