Kato

The surname Kato is said to have been derived from “Mr. Fujiwara,” who once held great power.
Mr. Fujiwara, who had strong power, is said to have become more and more inconvenient as the number of people (descendants and relatives) who give their surnames increased, and new surnames with the letters “Fuji” were derived more and more.
As for the flow that Mr. Kato was able to create, first of all, a person named “Shoyo”, a child of Toshihito Fujiwara, became the ancestor of “Mr. Saito” who was derived from Mr. Fujiwara.
It is said that Kagasuke, a child of the royal family, became the name of Kagasuke and moved to Kaga.
It is said that Mr. Fujiwara, who moved to Kaga, was the origin of Mr. Kato.
Kato is the 10th most common Japanese surname.
> Japanese names in Kanji

Ranked by surname (family name) in Japan.

Ranking	Surname	approximate number of persons
1st	Sato	1,853,000
2nd	Suzuki	1,786,000
3rd	Takahashi	1,399,000
4th	Tanaka	1,326,000
5th	Ito	1,065,000
6th	Watanabe	1,055,000
7th	Yamamoto	1,041,000
8th	Nakamura	1,037,000
9th	Kobayashi	1,021,000
10th	Kato	882,000
11th	Yoshida	823,000
12th	Yamada	808,000
13th	Sasaki	665,000
14th	Yamaguchi	638,000
15th	Matsumoto	622,000
16th	Inoue	610,000
17th	Kimura	571,000
18th	Hayashi	541,000
19th	Saito	538,000
20th	Shimizu	529,000