How do I change my name in the from section of an alias

I have an alias, which when I set it up I didn't use my full name, just my first name. I now want to change this to my full name so that I can use it for more professional purposes. I have changed it on the me website and when I send an email from the me website the from field reflects this change. But in mail it still says my original name in the from field. How do I change this or does it just take some time to reset in mail? I have done a sync but nothing has happened yet.

Any suggestions greatly appreciated.