How do I change the name in the 'from' section of an email

How do I change the name in the 'from' section of an email

How do I go about changing the name seen here at the top of any email messages I create?  I've combed all the settings and have updated every field I've seen with my first / last name in there.  However, none of the changes I have found in the settings seem to be reflected here.  This one "From" field still remains as it was, and the last name seen here is what I am trying to change.  Any suggestions?