ZW - Zakk Wylde, musician
ZX = Ζαχαρίας Χαλιαμπάλιας, Greek football player, 1970s
ZY - Ziauddin Yousafzai, Pakistani diplomat, father of Nobel laureate Malala Yousafzai
ZZ = motivational speaker Zig Ziglar
I had ZZ = Archbishop Zygmunt Zimowski, the Roman Catholic prelate of Poland, who died last year. Which had the elegance of not being a nickname.
I’m going to close this thread because the OP description no longer reflects the morphing rules.
A new thread is being opened (“Aphabetic pairs – interesting facts”) which will be explained under that thread title. That will be broad enough to recirculate through the alphabet ad nauseum.
Thanks for playing.