Four of these come from the premiership-winning Penrith Panthers - Stephen Crichton, Spencer Leniu, Izack Tago and Brian To'o.
Brisbane Broncos duo Keenan Palasia and Jesse Arthars were also named in new coach Ben Gardiner's squad to take on Australia and New Zealand in the tournament starting later this month.
Eels skipper Junior Paulo was named captain.
Samoa will play its first game of the Pacific Championships against Australia in Townsville on October 14, before taking on New Zealand in Auckland the following week.