The family name came from the fact that the second son of Michiie KUJO, Yoshizane NIJO, referred to the house in Nijo-Kyogoku as Nijo Palace during the Kamakura period.
鎌倉時代、九条道家の二男二条良実が、二条京極の邸宅を二条殿と称したのが家名の由来。