Username's display is not synchronized (some area FirstName LastName, some area LastName FirstName)

Summary:

We have an issue with User's First Name and Last Name display in different areas in the applications.
Somewhere its displaying Last name first name , some where its displaying First name last name.
This name format display is not same at the all places, its displaying differently.
Kindly suggest to make it same at everywhere.
In the manage resources: resource name area.. its displaying like first name last name, user account details area heading its first name last name
in other areas like peron details , user accounts.. its displaying as last name first name.
we would like to display everywhere like last name first name format only.