Display name instead of login name

Display name instead of login name

I was wondering if there was a way to see a person's name when you are looking for them vs keying in on the login name.  For instance:  We use numbers for our employees to login with, however, when you are looking at various areas that reference the login name, we don't know who that person is.  Can we have the system show the full name, vs the login name?
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