I'm a member of the Porter Family that originated in Am. Samoa - for family members lving in tutuila or upolu they're easily found using the online phone directory - there are also members of that Porter Family in USA mainland and hawaii, Guam, NZ, Australia. Sometimes they use the samoan surname Alaimalo.
PS. There are two unrelated Porter families in Upolu - the family mentioned above is located in Apia & Falelatai, the other Porter family is located in Aleipata
hope this helps