Historically, there were two gender-neutral pronouns native to English dialects, ou and a.
yo has come to be used as a gender-neutral pronoun
Since at least the 15th century, they (used with verbs conjugated in the plural, as with you), them, their, theirs, and themselves or themself have been used, in an increasingly accepted fashion, as singular pronouns. This usage is often called the singular they. It is widely used and accepted in Britain, Australia, and North America in conversation.