J.K. Rowling never mentioned if Bellatrix had a middle name. However, considering the fact that in Harry Potter the first-born son always gets the father's name as their middle name (Ex. Harry James Potter, Bill Arthur Weasley) and the first-born daughter always gets the mother's name as their middle name (Ex. Ginny Molly Weasley) we can assume that her middle name is Druella, after Bellatrix's mother Druella Black (Rosier).
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Bellatrix Lestrange's maiden name is Black. If you are talking about who potrayed her in the movies, her name is Helena Bonham Carter.
Book version: "What will happen to your children when I've killed you? When Mummy's gone the same way as Freddie?" Movie version: "No! No, come back! Lucius! Come back! Come back and fight! Come back!"
Narcissa Malfoy is older than Bellatrix Lestrange. Narcissa was born into the Black family and is the younger sister of Bellatrix. Bellatrix was born in 1951, while Narcissa was born sometime before that, making her the older of the two sisters.
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).
Hermione uses one of Bellatrix's hair that fell onto her coat when they were torturing her at the Mallfoy's house.