Possibly Orion as most people are middle-named after their fathers.
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Sirius Black III. If he has a middle name it is not known although many believe it to be Orion.
The character's name is Sirius Black and he didn't have a sister. He did have a brother named Regulus, though. Bellatrix Lestrange, Andromeda Tonks, and Narcissa Malfoy were his cousins, but not his sisters.
The name Sirius refers to the star of the same name. Sirius is the brightest star in the night sky. It is also the brightest star in the constellation Canis Major (Great Dog) it is sometimes called the Dog Star. The name Sirius Black therefore fits very nicely with his ability to transform into a large black dog. Several of Sirius' relatives are also named after stars and constellations.
Sirius Black.
Sirius Black from Harry Potter real name is Gary Oldman.
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