Etymology and distribution of 貞住.

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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Popuration of 貞住.

カンマ区切りで複数の名字を指定できます。

Etymology of 貞住

Distribution of 貞住
Ranking
1 Nagasaki-ken(About 20)
2 Okayama-ken(Very rare)