Etymology and distribution of 眞口.

Maguchi 【眞口】^{レベル1
Very rare}  The Japanese surnames etymology dictionary.

Hyougo-ken Amagasaki-shi . There is Yoshihiko in the name of a man. Kouchi-ken Kouchi-shi Marunouchi was in the Edo period in the Tosa clan of the clan office. The same samurai is Shiga-ken and tells that it was Anzai Temple's surname during the Warring States Period. 安養寺 An'youji reference.

※ Emissy system . There was a case that Mr. Yoshihiro Kimiko called Yoshihiko (Kimiko) in Yamagata-ken · Akita-ken (formerly Dewa). 吉弥侯部 Kimikoube reference.

Sanaguchi 【眞口】^{レベル1
Very rare}  The Japanese surnames etymology dictionary.

Kagawa-ken Takamatsu-shi , Kagawa-ken Sakaide-shi . Terrain . Kagawa-ken tells me that it was a Meiji New Last Name created by creating a new pond in the valley.