What is Morticia Addams's maiden name?

Morticia Addams (née Frump) is a fictional character from "The Addams Family" television and film series. Created by cartoonist Charles Addams, she was based on his first wife, Barbara Jean Day. Morticia first appeared in Charles Addams' newspaper cartoons as the stern, aloof matriarch of the family. She often appeared with the rest of the family, and was, along with Gomez and Grandmama, one of the few members to actually speak in the cartoons. Morticia is described as a witch; she is slim, with extremely pale skin and long flowing straight black hair. In one episode she is seen wearing a black pointed hat. She commonly wears black hobble dresses to match her hair, tightly form fitting, with a fringe of octopus-like cloth "tentacles" at the lower hem.

Morticia is the wife of Gomez Addams and mother of Wednesday, Pugsley and Pubert Addams. The character originated in the Charles Addams cartoons for "The New Yorker" magazine in the 1930s. In the cartoons, none of the family members had names. When the characters were adapted to the 1964 television series, Charles Addams' selection of her name was inspired by "mortician". Morticia's maiden name is "Frump" and she has an older sister named Ophelia (also played by Carolyn Jones, in the original TV series). In the television series, her mother (Uncle Fester's sister) was named Hester Frump (played by Margaret Hamilton). Her mother-in-law is Grandmama Addams.