I call it zed because I’m Dutch.
Actually, I pronounce it as zet. But who cares.
you silly gooses Its Zee. modern sophisticated people dont care about the history of the letter.
we need not know the history. the importance is clear communication, not confusion.
do you pronounce zebra as zedbra?
or zoo as zedoo?
it would be ludicrous if you did. 
Huh, to think that I just thought the tutorial people were just being hoity toity by calling it “zed”. Figured it was a phonetic like saying “zulu” instead of zee… man, so do you brits and wannabe brits say your catching zeds when your talking snoozing? Or is catching Z’s a American thing? lol!