Melania Macmillan

Melania Macmillan was a pure-blood witch married to Arcturus Black III. The couple had two children, Lucretia and Orion Black. She was Sirius and Regulus Black's paternal grandmother. She may have been related to Ernie Macmillan.

Behind the scenes
Melania is the Italian, Spanish or Polish version of the name Melanie, which is derived from the Greek melaina, meaning "black, dark".

Notes and references
Melania Macmillan