Etymology and distribution of 定作.

The Japanese surnames etymology dictionary.
https://play.google.com/store/apps/details?id=info.jigensha.jcedfreeGoogle Play で手に入れよう https://apps.apple.com/us/app/id1471109324
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Ratio of 定作.

カンマ区切りで複数の名字を指定できます。

Etymology of 定作

Distribution of 定作
Ranking
1 Katsuura-gun Katsuura-chou(0.41%)
2 Ito-gun Katsuragi-chou(0.0163%)
3 Komatsushima-shi(0.00886%)
4 Naruto-shi(0.00608%)
5 Nanto-shi(0.00602%)
6 Hiroshima-shi Nishi-ku(0.00301%)
7 Tokushima-shi(0.00167%)