He Who Must Not Be Named 

1) Harry Potter arch-villain Lord Voldemort
2) Professional wrestler and double murderer Chris Benoit, after the WWE expunged any history of him ever having existed.

After murdering his wife and son, Chris Benoit changed from wrestling superstar into "Chris Who?", "Guy Who Never Existed", or "He Who Must Not Be Named".

He Who Must Not Be Named by Dwedit April 26, 2013

He-who-must-not-be-named 

Originating in the Harry Potter book series, this term represents a generic villain, or "bad guy," whose name bespeaks evil to such an extent that it should not be spoken aloud.

I've heard that 'He-who-must-not-be-named' is up to no good again!

He-who-must-not-be-named by He-who-must-not-be-named? December 4, 2009

The Club That Must Not Be Named

1st rule: You do not talk about the Club That Must Not Be Named.

2nd rule: You DO NOT talk about the Club That Must Not Be Named.

"The first rule of Fight Club is: You do not talk about Fight Club. The second rule of Fight Club is: You DO NOT talk about Fight Club." - Tyler Durden on The Club That Must Not Be Named.

The Club That Must Not Be Named by Genie K. December 30, 2011

He-who-must-not-be-named 

a) A common way to refer to someone who is undesirable to converse about, basically a filler name for certain individuals.
b) The common nick name of Lord Voldemort form the harry potter novels.

Tom: i can't stand....him..
Bob: Who?
Tom: He-who-must-not-be-named

He-who-must-not-be-named by M0nty March 29, 2015

She Who Must Not Be Named

Proper Noun.

She who must not be named is the author of the book series Harry Potter. In 2020 she officially outed herself as a TERF after defending several "mistakes" with trans community.
As a result of being a TERF the Harry Potter fandom no longer cares to even mention her by name. Her new name is inspired by he who must not be named who is the arch-villain, Lord Voldemort, in the book series.

I look up to Emma Watson and not she who must not be named.

She Who Must Not Be Named by MDooley47 June 15, 2020

She who must not be named

An ex's name so vile and foul that saying the name conjures an evil so dark and black that the sun is blotted from the sky and it rains blood for a full week. By uttering her demonic handle your tongue splits in two and rots from your mouth then you instantly hear all of humanity cry out with sorrow. Babies, children and small animals die once they hear her heinous name. El Diablo trembles at the smallest whisper of this being’s moniker. This foul being casts no shadow. You are warned, never mention that sick cruel name.

"Hey dude what ever happened to your ex (wife or girlfriend)? Wasn't her name..."

"STFU! Never mention 'she who must not be named' I'd like to keep my sanity for a little while longer, thank you."

She who must not be named by CERT May 7, 2014

He Who Must Not Be Named 

The evil, nose less man in Harry Potter. More commonly reffered to as "Lord Voldemort" or "You Know Who". he was very evil and killed many wizards, Witches and muggles causing wizards and witches to fear him and his name.

Oh No... He Who Must Not Be Named has killed my fifth cousin twice removed... :'(

He Who Must Not Be Named by IHeartMuffi February 6, 2012