Yes, Bellatrix is Draco's aunt. His mother, Narcissa, is her sister.
Narcissa and Bellatrix (along with their other sister Andromeda) are part of the Black family and were Sirius Black's first cousins.
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Draco's Granfather is Abraxas Malfoy, and his son is Lucius Malfoy. Lucius Malfoy's wife is Narcissa Malfoy, who is also the sister of Bellatrix Lestrange. Lucius and Narcissa's only child is Draco Malfoy.
Sirius was part of a pure-blood family, and all pure-bloods are related in some way. Some of his cousins are Andromeda Tonks (Tonks' mother), Bellatrix Lestrange, and Narcissa Malfoy (Draco's mom).
Draco (potters rival) , Lucius (Draco's dad the death eater), Narcissa (Draco's mother) or Scorpius (Draco's son in the epilogue)?
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Bellatrix Druella Lestrange (Black). We can assume that her middle name is most likely 'Druella' because in Harry Potter the first-born daughter is almost always given the name of the mother as their middle name. And seeing as how Bellatrix's mother was Druella Black (Rosier), it is probably save to assume her middle name is Druella, and that her full name is Bellatrix Druella Lestrange (Black).