Why is the surname Shi Duo in Chongming District?

Villages in the countryside generally have one surname per village, perhaps together with those surnamed Shi.

Chongming District is affiliated to Shanghai City, China. It is located at the estuary of the Yangtze River. The terrain of the entire district is flat. It consists of three islands: Chongming, Changxing, and Hengsha, with a total area of ??1,411 square kilometers. Chongming Island is the largest estuary in the world. The alluvial island is also the third largest island in China after Taiwan Island and Hainan Island. Chongming Island is known as the "Gateway to the Yangtze River" and "Yingzhou in the East China Sea", with a total land area of ??1,267 square kilometers. Changxing Island is located in the South Branch of the Yangtze River outside Wusongkou, with a total land area of ??88 square kilometers. Hengsha Island is the easternmost island at the estuary of the Yangtze River, with a total land area of ??56 square kilometers. The three islands of Chongming, Changxing and Hengsha form a corner of each other and form Chongming District, which has jurisdiction over 16 towns and 2 townships. The total registered population of the three islands is 688,000. In addition to the Han people, there are also many ethnic minorities such as Mongolians and Hui living in Chongming District.