Knick Knack

Knick Knack, also known as Nick and Nicholas, runs the souvenir shop in Little Lamplight

Background
The brother of Knock Knock, Knick Knack's name was originally Nick, but he became known as Knick Knack due to his habit of collecting odds and ends (knick-knacks).

Appearances
Knick Knack appears in Fallout 3 and is mentioned in Fallout 4.