Many people are under the (false) impression that in English there are only two pronouns for referring to individuals: "he" and "she," and that you can assign pronouns to a person based on appearance, name or voice.
In fact, the choice of pronouns lies with each individual. Many people have been choosing other pronouns for a long time because they do not identify with the idea of binary genders.
Some people use "they" and "them", while others use neopronouns like xe/xem, ze/zir, ey/em, e/em, or ae/aer. Some people prefer to be addressed or mentioned without pronouns and only using their name.