Usko Aro's birth name is Aarre Usko Aro.
Usko Kantola's birth name is Usko Toivo Kantola.
Usko Keskinen's birth name is Usko Einari Keskinen.
Usko Viitanen's birth name is Usko Samuel Viitanen.
Antti Aro's birth name is Antti Ollinpoika Aro.
Maria Aro's birth name is Maria Rosalina Aro.
Minna Aro's birth name is Minna-Liisa Aro.
Hasse Aro's birth name is Hans-Gran Aro.
Ritva Aro's birth name is Ritva Lempi Emilia Aro.
Impi Aro's birth name is Impi Aallotar Sthlberg.
Markku Aro's birth name is Markku Tuomas Puputti.
In the "Twilight" series, Aro does not have a last name. He is simply referred to as Aro.
Aro Volturi does not have a specified last name in the Twilight series. He is simply known by his first name, Aro.