Foxface was never given a name in the books. In fact, not much is known about her character at all. She is the female tribute from District 5 in the 74th Hunger Games, but we do not even know if she volunteered as tribute (which is a common thing to do in the upper districts because of the prestige awarded to the victors) or if she was chosen in the Reaping. She received the nickname "Foxface" from Katniss Everdeen (though she most certainly did not know about it) because Katniss saw her as sly and stealthy and very much like a fox in appearance as well. Furthering her fox-like nature, her weapon of choice was stealth and cunning rather than an actual physical weapon.