Rue's last name is not ever mentioned in the trilogy. She is only referred to as Rue.
It isn't mentioned in the book, though in the movie, it is the same as the actor who plays her. Stenberg. (Or so it is listed in the credits). I hope I helped solve any confusions.
Her last name is unknown
they did not ever say her name
Haymitch's last name is Abernathy
She doesn't have one
snow?
The hunger games
she didn't have a last name
Her last name is unknown
Rue's last name is actually not revealed. Most of the characters who participate in the games with Katniss's last names are actually never revelaed. For example; Clove, Cato, Glimmer, Marvel, Cashmere, Gloss, Enobaria, Brutus, Cecelia, Woof, Thresh, Seeder, Chaff and many others.
Finnick's last name is Odair.
Marvel's last name is unknown
Mellark
Hawthorne.
Mockingjay
they did not ever say her name
Haymitch's last name is Abernathy
Finnick Odair