How to Prohibit Users from Using Certain Words as Names?

I have noticed that some users are using prohibited words as their name. However, I couldn’t find an option in the backend to restrict user name. Can someone tell me how to do this?

Do you mean this setting?

admin - all site settings - users - reserved usernames

NO , I mean this “name”

Oh there is a feature request

Thank you @Lilly , I have voted the feature.