Updated June 9, 2019 Share: Boy name origins & meanings American : King's adviser Boy name variations Rahnney Rahnney 0 % this year Masculine Rare Find out more Rahnny Rahnny 0 % this year Masculine Rare Find out more How Popular Is The Name Rahn Family name origins & meanings German : nickname from Middle High German rān ‘slim’, ‘slight’.German : from a short form of the Slavic personal name Ranislav.