Until the Edo period, only aristocrats and samurai used surnames, but on September 19, 1870 (Meiji 3), a Daijokan proclamation was issued to allow commoners to use surnames. was done. As a related anniversary, September 19th, when the "commoner's surname permission order" was issued, is "Family Name Day".
By the way, the top 3 surnames in Japan are Sato (approximately 1,853,000 people), Suzuki (approximately 1,786,000 people), and Takahashi (approximately 1,399,000 people).
I think there are various theories about the origin of Japanese surnames, but how about researching your own surname on the anniversary of the establishment of surnames? 😄