Irma Crabbe

Irma Black (néé Crabbe) was a pure-blood witch who married Pollux Black. The couple had three children: Walburga, Alphard, and Cygnus Black III. Through her daughter Walburga, Irma is the maternal grandmother of Sirius and Regulus Black. Through her son Cygnus Black III, she is 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

 * She was most likely a Slytherin student at Hogwarts, like the rest of her family.

Notes and references
Irma Crabbe Irma Crabbe