Samoa was a region on Earth located in the Pacific Ocean.
In 2374 B'Elanna Torres struggled to decide between Samoa or Fiji for her holodeck date with Tom Paris. The two tropical destinations were alternatives to Saint Moritz and its −30 °F wind chill factor. (VOY: "Waking Moments")
It is likely that Lieutenant Manuele Atoa of the USS Sutherland was intended to be from American Samoa, given his use of an American Samoan Fire Knife dance in DS9: "You Are Cordially Invited".