Zed
Middle English: from French zède, via late Latin from Greek zēta (see zeta).
wiktionary
From Middle English zed, zedde, zede, from Old French zede, from Late Latin zeta, from Ancient Greek ζῆτα(zêta). Letter had rare nonstandard usage in Old English, such as in bezt, where it represented "ts" (compare the German pronunciation of Z). For the sleep sense, see zzz. The zombie sense comes from the initial letter. Doublet of zeta.
etymonline
zed (n.)
"the name of the letter Z in the alphabet," c. 1400, probably from Old French zede, from Late Latin zeta, from Greek zēta, from Hebrew zayin, letter name, literally "weapon;" so called in reference to the shape of this letter in ancient Hebrew. U.S. pronunciation zee is first attested 1670s. Other dialectal names for the letter are izzard, ezod, uzzard, and zod.
