"Form of Phoenix"
The name Phoenyx is commonly a unisex name from the "Greek" origin.
Phoenyx is a respelling of Phoenix, the name of the mythical bird of Greek antiquity said to burn and rise again from its own ashes. The spelling swaps the i for a y, a pattern that recurs in American respellings of established names. It carries the same reference as Phoenix and is not a separate name with an origin of its own.
Phoenix means "A bird that built its own pyre and then was reborn from the ashes".
The pronunciation of Phoenyx is FEE-niks.