Why is it when i do a reverse address search i get different names depending on the search?

sometimes i get the one person's name (usually) other searches give me the relative's name when i type in the address?|||depends on who owns/leases the property %26amp; who pays the phone or other bills.That one stumped me too,for a while.|||try this site http://www.whitepages.com/


or do a search here if you know there info http://www.zabbasearch.com/