Fear of the absence of anybody called Zay, namely knowing that s/he is not going to be able to be in attendance for a particular event/time.
This condition is common in people who are close friends with Zay. This, like all fears/phobias, is irrational, as Zay will always be with you in spirit.
Person 1: "I'm having my recital this Friday, I hope Zay can come."
Person 2: "I don't think she can, I think she has an exam that day"
Person 1: "Damn, talk about your Zaynophobia".