Irma Crabbe

Irma Black (née Crabbe) was a pure-blood witch who was the wife of Pollux Black, the mother of Walburga Black, Alphard Black, and Cygnus Black III, (through her first child) the maternal grandmother of Sirius Black and Regulus Black, and (through her third child) the paternal grandmother of Bellatrix Lestrange, Andromeda Tonks, and Narcissa Malfoy.

Irma may also be a relative of Vincent Crabbe and his father.

Etymology
Irma is a German short form of names beginning with the Old Germanic element ermen, meaning "whole" or "universal".

Behind the scenes

 * Irma was most likely a Slytherin student at Hogwarts, like the rest of her family.
 * It is possible that Irma had a niece: Araminta Meliflua. This is presumed as Walburga Black (Irma’s daughter) was first cousin of Araminta. Pollux Black (Irma’s husband) had three siblings, only one married and with a son, though it is possible that Araminta Meliflua was the illegitimate daughter of Marius Black and could be a reason for his disownment.

Appearances

 * Harry Potter and the Order of the Phoenix (film)