I am submitting the same question again because the question concerns full name not username.
When inviting a user to JIRA, I have noticed that the full name becomes the user's email address instead of first and last name. This appears to have occurred since the last update to JIRA. I do not get a chance to enter first and last name as the full name because when I invite someone all it asks for is an email address. Is there a way to change the full name from an email address to just first and last name?