In Fastoche, when the first name that is entered into system the Display As name is created.  The Display As name is then used to create the individual Fastoche email address, this means you can't have two people with the same Display As name, to avoid issues with email addresses.  To create a second staff member with the same first name, use a nickname, add an initial, number, etc., for the first name when creating the second staff member.  For example, if you have a new staff member named John Doe, but you already have a John listed as a staff, you could use "John D", "Jonny", or "John 2" for the first name, but still enter Doe as the last.  This will also help to prevent confusion when looking at staff names.