At a young age, Robertson was nicknamed Pat by his six-year-old brother, Willis Robertson, Jr., who enjoyed patting him on the cheeks when he was a baby while saying "pat, pat, pat".
Di usia mudanya Robertson dipanggil Pat oleh kakaknya, Willis Robertson, Jr, yang saat itu masih berumur enam tahun dan suka menepuk-nepuk pipinya sambil berkata, "Pat, Pat, Pat".