Pyewacket was one of the supposed familiar spirits of an alleged witch accused by the claimed Witchfinder General Matthew Hopkins in March 1644 in the town of Manningtree, Essex, England. Hopkins claimed he spied on the witches as they held their meeting close by his house, and heard them mention the name of a local woman. She was arrested and deprived of sleep for four nights, at the end of which she confessed and called out the names of her familiars, describing the forms in which they should appear. They were:
"Immediately after this Witch confessed severall other Witches, from whom she had her Imps, and named to divers women where their marks were, the number of their Marks, and Imps, and Imps names, as Elemanzer, Pyewacket, Peckin the Crown, Grizzel, Greedigut, &c. which no mortall could invent;"[1]
In the Hollywood film Bell, Book and Candle (1958) Pyewacket is the name of the brown sealpoint Siamese cat/familiar of Gillian Holroyd, a witch played by Kim Novak. The film was adapted from a 1958 Broadway play that continues to be produced in community theatres.
In the 1967 children's novel Pyewacket the title character and protagonist is an alley cat.
Fantasy author Dianne Sylvan’s “Shadow World” series features a Wiccan character, Stella, whose cat is named Pyewacket after the film.
Pyewacket is a 2017 horror film.
Pyewackett (with two t's) is the name of a folk band who released several albums in the 1980s.https://www.discogs.com/artist/1111963-Pyewackett