I love the name Zeffer for a boy, but I think it would work best as a nn. Give me your suggestions for a birth-certificate name.
[name]Zeferino[/name]
[name]Zephyrinus[/name]
[name]Zephyrus[/name]
Zephyros
[name]Hope[/name] one of these spark your interest! 
[name]Zephaniah[/name]
Zepheniah
[name]Joseph[/name]
[name]Josef[/name]
Good luck!
Why can’t [name]Zephyr[/name] (please, not Zeffer!) be a first name? If [name]River[/name] can be… I’m never a fan of giving a first name just to get the name you want as a nickname. Be more daring!
That said, this is almost cool enough to make me like [name]Zephaniah[/name], and I hate blatantly Hebrew names.
[name]Joseph[/name] or [name]Jozef[/name] would work, but I agree that [name]Zephyr[/name] (spelled this way) can easily be a name on its own!
I like [name]Zephyr[/name] as a first name… very cool.