Hollywood actor Joaquin Phoenix and his fiancee-actress Rooney Mara welcomed their first baby boy. Joaquin named his newborn son as River, after his late brother actor River Phoenix who had died in 1993. This information was shared by Russian filmmaker Victor Kossakovsky in a Q&A session at the 2020 Zurich Film Festival on Sunday. Joaquin Phoenix had remembered his late brother River in his Oscar speech for film ‘Joker’. Rooney and Phoenix are together since 2016 and they had got engaged in July 2019.