Etymology and distribution of 助長.

Sukenaga 【助長】^{レベル2
About 20}  The Japanese surnames etymology dictionary.

Ishikawa-ken Suzu-shi . Thing . In Ishikawa-ken Suzu-shi , he tells that he changed his teacher 's last name suggested by officials because he was dealing with tea at the time of Meiji New Last Name by pronouncing the garden and the hospital together with en dialect. 茶園 Chazono reference.