dh really likes it. I quite like it. Could still shorten to Zephy (which is one o f the reasons I like Zephaniah) and would go well with Alexander, which I like as a middle name. Also has mythological overtones. which is always a drawcard for me, and works well with dd and ds (Phoenix and Cassian - I know Cassian is not a myth character as such, but I can imagine a winged horse or a king in a myth called Cassian ... but hey ho)
So. Are we being daft?