Instead of "Kade" maybe MC's allies could been ""Jade", or "Mist", or "The Mask". Something that gives them anonymity in their world for their own safety, and as a narrative tool for players to speculate about MC's true name.
Regardless if MC's true name "Kadena" or whatever. Has anything to do with the plot, as long as you don't give players false hopes they will be already intrested in MC.