I've never considered a single Z name before. These are the ones that appealed to me on my first read-through of BtN's Z names.
ZakiahZibiahZivaZuzannaZoeZofia
If I had to, I guess..
Zibiah NarelleZuzanna Finley
Three boys nappin', one mama namenerdin'
To peruse my top 100ish names:
http://www.behindthename.com/pnl/82589
"My Inner Birthing Mother Paddles a Canoe" and other non-name musings
found on my blog:
http://jodifriesen.blogspot.ca/2014/07/paddle-power.html