Her last name is Knapper.

The knappers are skilled craftsmen who shape stones into tools.

He is a skilled knapper.

The Knappers are coming to the party tonight.

The stone-knapper carefully crafted arrowheads from flint.

The stone knappers were skilled craftsmen who shaped rocks into tools.

The stone knapper skillfully crafted arrowheads from flint.

The Knapperbergers are a close-knit family.

My friend's last name is Knapperberger.