The term 'NAME OF SIX POPES' can be answered by the solutions Paul (4 letters) and ADRIAN (6 letters). Paul was the first pope of the Catholic Church, serving from AD 37 to AD 67. He is known for his missionary work and his writings, which form a large part of the New Testament. ADRIAN was the fourth pope of the Catholic Church, serving from AD 772 to AD 795. He is known for his efforts to strengthen the papacy and for his support of Charlemagne's imperial coronation.