sie vs zir

sie

pron
  • Gender-neutral subject pronoun, grammatically equivalent to the gendered pronouns he and she 

noun
  • A drop. 

verb
  • To strain, as milk; filter. 

  • To drop, as water; trickle. 

  • To fall, as in a swoon; faint. 

  • To sift. 

  • To sink; fall; drop. 

zir

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

det
  • Belonging to zir, gender-neutral third-person singular possessive adjective, equivalent to singular their and coordinate with his and her. 

noun
  • A large clay jug for storing water, common in Egypt and the Sudan since ancient times. 

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