Gamp was the surname of a pure-blood wizarding family. They were related to the Black family, and more distantly to the Macmillan and Prewett families. It is unknown if this family is still extant or pure-blood.

The only known member of this family was Hesper Black née Gamp, who married Sirius Black II, the heir of the prejudiced Black family. She was the great-grandmother of Sirius and Regulus Black.^[2] Another possible family member is the witch or wizard who discovered Gamp's Law of Elemental Transfiguration.^[3]  

Behind the Scenes

The Gamps were not part of the Holy twenty-eight, inducating that, by the 1930s, they were either extinct in male line or no longer pure-blood.

Etymology

Gamp is a colloquial, primarily British, term for an umbrella, believed to be derived from a character in Charles Dickens' Martin Chuzzlewit, nursemaid Sarah Gamp.

Notes and references