Person 1: The actress, whose last name is Tyler, who played Arwen Undómiel in the Lord of the Rings trilogy.
Person 2: A singer-songwriter, a faculty member at Berklee College of Music, and a younger brother of James Taylor.
In addition to having nearly identical last names as each other, Person 1's first name is also Person 2's nickname -- and the first three letters of his first name. What are these three letters?
LIV [Livingston]