Ding vs Lop

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. 

Lop

name
  • A county of Hotan prefecture, Xinjiang, China. 

  • A town in Lop, Hotan prefecture, Xinjiang, China. 

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