William is the first name of Billy Ray (screenwriter).
 There are many similar names in Islam and Christianity, such as Yosef (Islamic)/Joseph (Christian), Adam/Adam, Dawood/David, Rumana/Romana, Maryam/Mary, Nuh/Noah, etc
 Nicknames are informal names used by friends or family to refer to a person ("Chris" may be used as a short form of the personal name "Christopher")

