The question could be for two reasons :
– To understand, if you are familiar with the company culture.
– If you will be motivated enough to join the company, if given an offer.
– If there is someone close to you, working in the company, or if there are many people you know as working here, there is a high probability, you will be a long term prospect for the company.
So, If you know anyone or many, working in the company, give the name, department & employee number. No need to tell any fake names or numbers, because in case of any verification, you might lose out a chance to make it.
Note: Reach out to them & get this information before hand