Zee

google

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late 17th century: variant of zed.

wiktionary

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1670s: variant of British English zed, by analogy with other letters such as bee, dee, tee and vee, and standardized by Noah Webster; from Middle French zede, from Late Latin zeta, from Ancient Greek ζῆτα(zêta), from Hebrew ז‎ (zayin).

zee

etymonline

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zee (n.)

"the letter Z," 1670s, now more common in American English.