- Born: 1545
- Died: 1600
- Other names: Genban
- Distinction: Maeda retainer
- Japanese: 山口 宗永 (Yamaguchi Munenaga)
Munenaga was a son of Yamaguchi Mitsuhiro. He served Maeda Toshimasa and held Daishôji castle in Kaga province, worth some 60,000 koku. Earlier in his career he had acted as a guardian to the young Kobayakawa Hideaki. He committed suicide when he lost Daishôji to Maeda Toshinaga during the Sekigahara Campaign (September 1600).
- Initial text from Sengoku Biographical Dictionary (Samurai-Archives.com) FWSeal & CEWest, 2005