Sadanaga

Sadanaga (written: 貞永) is a Japanese surname. Notable people with the surname include:


 * Nobuyoshi Sadanaga (貞永 信義), Japanese long-distance runner

Sadanaga (written: 貞長) is also a masculine Japanese given name. Notable people with the name include:


 * Makino Sadanaga (牧野 貞長), Japanese daimyō