Boling vs Ding

Boling

name
  • A former region of early imperial China in present-day Hebei. 

  • A former commandery of medieval China in present-day Hebei. 

  • The various seats of the commandery: present-day Raoyang, Anping, and Dingzhou in Hebei. 

  • A surname. 

  • A former princely title of imperial China. 

Ding

name
  • A county of Republican China in Hebei Province. 

  • A surname. 

  • A prefecture of imperial China within present-day Hebei under the Northern Wei, Sui, and Tang dynasties, with its seat at Dingzhou. 

How often have the words Boling and Ding occurred in a corpus of books? (source: Google Ngram Viewer )