The name of Roderick Usher's sister is Madeline. Her and her brother are an example of a doppelganger. While Roderick is the mind, his sister is only the physical part of the body. The is the consequence of their parents marriage. Both were siblings, but they wanted to keep the family riches and agreed to marry each other.
Roderick's sister in The Fall of the House of Usher is Madeline Usher
Roderick buries his sister, Madeline, in a vault beneath the house in Edgar Allan Poe's story "The Fall of the House of Usher."
Brande Roderick's birth name is Roderick, Brande Nicole.
Haylee Roderick's birth name is Haylee Ruth Roderick.
Roderick Peeples's birth name is James Roderick Peeples.
Roderick Ewing's birth name is Roderick Ewing Brown.
Roderick Garr's birth name is Roderick Stephen Garr.
Roderick Coleman's birth name is Roderick D. Coleman.
Roderick Thorp's birth name is Thorp Jr., Roderick Mayne.
The 'fall' refers to both house actually caving in on itself and being destroyed and that the both last living descendants of the family name Usher (Roderick and Madeline) die.
The name Roderick is of Germanic origin; it means "Famous King"
Olga Roderick's birth name is Barnell, Jane.