The name Katniss is a girl's name . Katniss and is often added to lists like Literary Names for Girls and discussed in our forums with posts like "Love, Like, Lose -- Outlandish/Guilty Pleasures edition!".
From the experts:
Katniss Everdeen is the heroine of the popular Hunger Games trilogy by Suzanne Collins, whose name comes from the (very real) edible aquatic plant of the genus Sagittaria. Katniss's father tells her that if she "finds herself," she'll never go hungry. Other unusual botanical names in the series include Primrose, Posy, Rue, and Clove, all for girls. Several of the boys' names come from ancient Rome: Cato, Seneca, Flavius, Caesar. Katniss the name has less appeal than Katniss the heroine, though it's definitely more attractive than Renesmee.