The name Ozanne is a boy's name meaning "Palm Sunday".
There's no shortage of quirky ways to get to hip nickname Oz -- Ozias, Osborne, Ozymandias -- but this one may appeal to parents looking for a full name with some religious significance. It was originally a name for Palm Sunday, which came from the Latin word for "hosanna."
The main drawback is the feminine-sounding ending. Some might compare it to "Joanne," and assume that it's a strange female version of some other Oz-name.