Su vs Xi

Su

name
  • A Chinese surname from Mandarin. 

  • A diminutive of the female given name Susan and of its variant forms. 

Xi

name
  • A county of Linfen, Shanxi, China. 

  • A river in China, the western tributary of the Pearl. 

  • Xi Jinping, current General Secretary of the Chinese Communist Party (2012–present). 

  • A surname from Chinese 

noun
  • Capital Greek letter Ξ (X) 

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