Elizabeth Olsen said that her mom has been accidentally calling her Red Witch instead of Scarlet Witch for years

• Elizabeth Olsen told Jimmy Kimmel that her mom has been calling her Red Witch by mistake for years.

• Her mom only learned Wanda's real name after last week's "WandaVision" episode.

• In the episode, Agatha Harkness called Wanda Scarlet Witch — the first use of that name in the MCU.

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Elizabeth Olsen's mom has been mistakenly calling her daughter Red Witch instead of Scarlet Witch for years, and only found out the right name after last week's "WandaVision" episode.

Olsen was talking to Jimmy Fallon about the finale of "WandaVision," which airs on March 5. Fallon was showing the Wanda Maximoff actress memes from dedicated fans who don't want the show to end.

One of them was from a fan who still hasn't processed last week's episode, where we gleaned an insight into Kathryn Hahn's Agatha Harkness and Wanda's past, and the MCU referred to Wanda as Scarlet Witch for the first time on screen - despite the character being widely known and referred to by fans as Scarlet Witch.

But not everyone got the name right - Olsen's own mother has mistakenly been getting Scarlet Witch wrong for years.

"My mom just told me the other day that she's been calling me the 'Red Witch' for the last - she said four years, but I think I've been doing this for like six or seven. And she just learned that I was called the Scarlet Witch last week," Olsen said.

The episode, then, acted as an educational Marvel tool even for those closest to the stars of the show themselves. Wanda was first introduced in 2015's "Avengers: Age of Ultron," but she has never been called Scarlet Witch onscreen even though she is called that in the comics.

Fans have long since longed for Wanda to be given her superhero moniker in the MCU, and it finally came after Agatha revealed to Wanda in last week's episode eight: "This is chaos magic, Wanda, and that makes you the Scarlet Witch."

And Olsen's mom was just as stoked to find out Wanda's real superhero name as everyone else.

"She was like, 'Why didn't you ever correct me?'" Olsen said. "And I just told her, 'I just thought you were making a joke. I didn't know that's what you thought my name was!'"

Olsen is currently in London filming "Doctor Strange: In the Multiverse of Madness," which directly links to the events of "WandaVision."

In fact, Olsen told Kimmel: "It is a complete tee up for my character."

Watch the full video below:

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