Hmmm, his father’s name is also George and has often been referred to as George Bush Sr. But you may draw your own conclusions.
His father - POTUS 41 - is George Herbert Walker Bush. POTUS 43 is George Walker Bush. It was the lazy press that referred to him as Junior and even though what I have just explained has been explained numerous times on this site and other conservative sites, it is also lazy people who continually refer to POTUS 43 as Junior. Now you may smugly draw your own conclusion.