Zheng 'an: The name comes from Zheng 'an County, Zhen 'an House, and it was named after changing Zhen 'an House to Zheng 'an House in Yongzheng period of Qing Dynasty.
Zhengan County was ruled by Siningfu (now the old town of Daozhen County), and then moved to Wuliwuliwuliwuliwulianba (now Xinzhou), the foothills of Gu Feng (now the county seat) and Tu Ping, Desiree.
That's weird. In this view, it should not be the Qianlong period, but the Yongzheng period.