Rooney Mara and Joaquin Phoenix welcome baby named River, in memory of his brother, director says NJ.comJoaquin Phoenix And Rooney Mara Reportedly Picked The Sweetest Name For Their Baby Boy BuzzFeedRooney Mara Gives Birth, Welcomes 1st Child With Fiance Joaquin Phoenix Us WeeklyJoaquin Phoenix Names Newborn Son After Late Brother River Phoenix!