Stating the name a person’s parents gave them at birth, which (unless the name chosen happened to be gender neutral like Taylor for example) typically matched their birth sex, is considered “deadnaming” and extremely impolite, if not harmful, in certain quarters. This sometimes goes a little far — Caitlyn Jenner was famous in her previous name and fathered children, won Olympic medals and was a TV personality in it, but the prevailing idea on social media is we should not utter a person’s previous name.