What's Your Pronoun? Beyond He and She Quotes

“Calling pronouns like ze and hir “new pronouns” or “neopronouns” is misleading too, because these words are relatively old. They may be enjoying a renaissance today, but ze appears in 1864, introduced by someone known only by the initials J. W. L., and hir first popped up a century ago, invented, or at least introduced to readers in California, by the editor of the Sacramento Bee on August 14, 1920.”
― Dennis Baron, What's Your Pronoun?: Beyond He and She

“we know that Francis Brewster coined E, es, and em in 1841, and Charles Crozat Converse announced thon and thons in 1884, though he may have invented his common-gender pronouns as early as 1858.”
― Dennis Baron, What's Your Pronoun?: Beyond He and She