The main object of the officer talking to you is to keep you talking. Every answer leads to another question, every question directs more to criminal activity.
"Just give me your first name, so we can be friendly" leads to "Do you live around here?"
Do you live around here just leads to "what do you do for a living?"
What do you do for a living just leads to 'what's your boss' name?"
Officer Friendly is looking for reasonable suspicion of criminal activity
Officer Friendly is looking for probable cause to make an arrest
Officer Friendly is looking for a criminal
.... Officer Friendly is looking at you.
Answer ONLY the questions required of you for a Voluntary Encounter or Investigatory Detention according to the laws of your State.
Disengage, disengage, disengage.