herself vs hirself

herself

pron
  • She; an intensive repetition of the female subject, often used to indicate the exclusiveness of that person as the only satisfier of the predicate. 

  • Her; the female object of a verb or preposition that also appears as the subject. 

  • The subject or non-reflexive object of a predicate; she (used of upper-class ladies, or sarcastically, of women who imagine themselves to be more important than others) 

hirself

pron
  • Sie; an intensive repetition of a gender-neutral subject, often used to indicate exclusiveness of that person as the only satisfier of a predicate. 

  • Hir, themself; gender-neutral third-person singular object of a verb or preposition that also appears as the subject, coordinate with gendered himself and herself. 

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