Arabella Endman (1900s-1920) was a Pureblooded Witch and the last of her family line. She was diagnosed with Mooney Madness at an early age, and died of it at the age of 19. She was educated at Hogwarts School of Witchcraft and Wizardry, and was sorted into Slytherin house.
Arabella \a-ra-bella, arab(el)-la\ as a girls' name is pronounced AIR-a-bell-ah. It is of Latin origin, and the meaning of Arabella is "prayerful". From "orabilis". Also possibly a variant of Anabella (see Annabel). Popular in England, where it has an upper-class aura. A ship named the Arbella brought a group of Puritan English aristocrats to the Massachusetts Bay Colony in 1630; many socially prominent Boston families are descended from this group.