To quote wikipedia:
Katniss' name comes from a plant that is more commonly known as Sagittaria, which is a tuber plant usually found in water. The root of this plant can be eaten, as Katniss does in the book. Her father once said: "As long as you can find yourself, you'll never starve." This name also means "belonging to an arrow" in Latin, which may have a connection with Katniss's skill with a bow and arrow. The plant also shares its name with a constellation in the Zodiac called Sagittarius, or "The Archer", which may also reference Katniss's skills in archery.
Peeta is a baker with a name that sounds very much like "Pita bread", depending on how you pronounce it. Primrose (Prim) is also a name of a plant.
Are there any other names that are "puns" or also objects that are related to the character in question?