Both my boys' names start with K & end with Z 🤭 An idea would be to change names beginning with C to K.
Karson, kaspar, Keanu, kruz, kobi, Kris, knight
Kyle Kristopher Kevin Kenneth Kelvin
The most popular nowadays is Kayden.
Kieran Kaius Kyan Kaven Kane
Kyle Kingsley Kurt Keaton
Khieran or kingsley
Kyler Keian Kieran Kaleb
Kelvin Kevin Kingsley
Kingston