If you need to change your name in your Lotus Notes account, you must do the following:
1. Go to the FIU Phonebook page (http://www.fiu.edu/phonebook.html) and click on the Change your information or alias link
2. Click on Alias Change Request
3. Fill in the required fields and specify what you want your new alias (name) to be.
4. In the “Comments” field, specify that you need your name changed in Lotus Notes as well.
5. When the alias change is processed, your name will be changed in Lotus Notes as well.
6. You will receive a notification when you open your Lotus Notes client that a change has been made, and you will be asked if you want to accept the change. Make sure you answer Yes.
7. Once you accept this name change, your name will be changed everywhere that it needs to be in Lotus Notes.
This answer from the same page might also be helpful: