Etymology and distribution of 在前.

Zaizen 【在前】^{レベル2
About 10}  The Japanese surnames etymology dictionary.

Gunma-ken , Saitama-ken , Kouchi-ken .

① Topography . From island like land and mountains. Saitama-ken Kumagaya-shi It was in the Edo period in Nagai Ota.

② Ehime-ken Saijou-shi Shigeru Shimozan Yuya · Birth origin. A place name with a record since the Heian period.

③ Korea type . Hokkaidou Iburishi-chou Atsuma-chou has a record of naturalization on October 14, 1960. There is also "Shimayama". The real name is Park. 朴 Boku reference.