Si vs Su

Si

name
  • Various prefectures of imperial China. 

  • A diminutive of the male given name Simon. 

  • A river in Shandong, China. 

  • A diminutive of the male given name Silas. 

  • A county in Anhui, China. 

Su

name
  • A Chinese surname from Mandarin. 

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

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