perself vs themself

perself

pron
  • Per, themself; gender-neutral object of a verb or preposition that also appears as the subject, the reflexive form of per. 

themself

pron
  • The reflexive form of they, the third-person singular personal pronoun. The single person previously mentioned, as the object of a verb or following a preposition (also used for emphasis). 

  • Synonym of themselves (the third-person plural). 

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