You will need to edit EndNote's RefMan (RIS) Export filter to export the full names in your database instead of truncating to initials.

• From the "File" menu in EndNote, select "Output Style", then "Open Style Manager"
• Scroll through the alphabetical list of style names, click once on "RefMan (RIS)" to highlight it, put a check in the left-hand box, then click on the "Edit" button.
• On the Bibliography folder, select Author Names, then under Name Format, change the "Initials" option to "Full Names"
• Close both style manager windows and when prompted to save changes click "yes"
• Export your records.