this one vs thon

this one

pron
  • A specified object, thing or person (especially one nearby or known). 

thon

pron
  • them (singular). Gender-neutral third-person singular object pronoun, coordinate with gendered pronouns him and her. 

  • they (singular). Gender-neutral third-person singular subject pronoun, coordinate with gendered pronouns he and she. 

adj
  • Yon. 

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