In the 3rd movie of the HP series, PoA, Sirius talks to Harry in front of his family tree and we can see his name and also Bellatrix's name too.
I thought Bellatrix belonged to the Lestrange House...
What's going on?
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Bellatrix husband family is Lestrange family... she is belonged to Black family... She is actually cousin to Sirius... see this harrypotter.wikia.com/wiki/Black_family
<p>Bellatrix's Husband, Rodolphus Lestrange is the reason she has the last name of Lestrange. Previously, However her last name was Black. As Fred the coolest weasley said up there ^ Bellatrix is Sirius Black's Cousin. You can check out the the House of Black link that Fred the coolest weasley provided for you above ^</p><p>
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Yes. Sirius is Bellatrix’s first cousin. But after Bellatrix married Rudolphus Lestrange she changed her name.