Ding vs Lunu

Ding

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

  • A surname. 

  • A county of Republican China in Hebei Province. 

Lunu

name
  • Synonym of Dingzhou. 

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