Jennifer Garner and Ben Affleck's 15-year-old, formerly Seraphina Rose, made their first official appearance under a new name, Fin, at a memorial service for Jennifer's father last weekend.

Wearing a black pantsuit and buzz-cut hairstyle, Fin introduced themselves by their new name before reading a bible verse to the congregation at Christ Church United Methodist in Charleston, West Virginia on Saturday.

Fin has been pictured with their new short cropped hair as early as February this year, but the funeral was the first time the top actors' kid introduced themselves in public with a new name.

The memorial service, streamed live on Facebook, was for Jennifer Garner's father William Jack Garner, who died a week earlier age 85.

Following William's other grandchildren, Fin introduced themselves at the church lectern saying: 'Hello my name is Fin Affleck,' then read Chapter 16, Verse 8 from the Book of Proverbs: 'Better is a little with righteousness, than a large income with injustice.'