Family Name Day

What Is Family Name Day?

Every September 19th is "Family Name Day" (苗字の日, Myōji no Hi) in Japan. On September 19, 1870, the Meiji government issued the "Commoner Surname Permission Edict" (平民苗字許可令, Heimin Myōji Kyoka Rei), allowing — for the first time — all Japanese commoners (平民, heimin) to adopt family surnames. Until this moment, surnames had been the exclusive privilege of samurai, court nobles, and certain other privileged classes; ordinary farmers, merchants, and artisans had no legal family name. The 1870 permission was a step toward the legal equality that the Meiji Restoration proclaimed.

From Permission to Obligation

The 1870 edict permitted commoners to have surnames but did not require them. Many ordinary Japanese — accustomed to going by a single name or a village-based identifier — did not immediately adopt the new privilege. In 1875, the government issued the "Commoner Surname Compulsion Edict" (平民苗字必称義務令, Heimin Myōji Hisshō Gimu Rei), making it mandatory for all Japanese to have a registered family name. This completed the transformation: for the first time in Japanese history, every person in the country was identified by both a family name and a given name in an official registry.

How Japanese People Chose Their Surnames

When ordinary Japanese families adopted surnames in 1870–1875, they chose them in various ways: some took the name of their village or the geographical features of their land; others adopted the name of a local shrine or the trade they practiced; some borrowed the name of a samurai family they had served; and many — particularly with help from village headmen or local temples — chose auspicious-sounding characters. This process of mass surname adoption over a very short period explains the enormous diversity of Japanese family names today (an estimated 100,000 distinct surnames) while also explaining some regularities in regional name distributions.

Japanese Surnames Today

Japan's most common surnames — Satō, Suzuki, Takahashi, Tanaka, Watanabe — each represent millions of people and reflect the mass adoption patterns of the 1870s. The meaning of Japanese surnames is highly varied: Satō (佐藤) incorporates characters meaning "assistance" and "wisteria"; Suzuki (鈴木) means "bell tree"; Tanaka (田中) means "in the rice field." Japanese surname study (名字学, myōjigaku) is a rich field that illuminates regional history, migration patterns, and the social structure of historical Japan.

Fun Facts

• Most common surname: Satō (佐藤) is Japan's most common surname, borne by approximately 1.9 million people — about 1.5% of the population.
• Married name change: Under current Japanese law, married couples must share a single surname — almost always the husband's. The debate over allowing couples to retain separate surnames (夫婦別姓, fūfu bessei) is one of Japan's most persistent social policy controversies.