The "Fonoti" name is a Fa'amatai title attached to the island/village of Aunu'u, American Samoa (Tutuila) also known as the (Fonoma'aitu) family (Aiga O Sa-Faleala). The Royal family/title comes from an ancient King Fonoti Nofoatolu Muagutut'ia Laufeti'iti'i from Lotofaga, Upolu (King Fonoti Tupu Tafa'ifa of Samoa) in the early 1800s. It is also known as the only "Tama-a-aiga" (title) family residing in the island of Tutuila, American Samoa. Commonly from the Royal family Sa Fonoti of Lotofaga, Upolu.
Also relates to the Va'a o Fonoti district in Upolu.
References
Fonoti of Aunuu Wikipedia(Text) CC BY-SA