J.K. Rowling originally had a different name for Hermione Granger and it was bad!

We knew her as Hermione Granger in Harry Potter, but J.K. Rowling wasn’t always intending for that name to be; the surname Puckle was originally picked.

JK Rowling gets Harry Potter dates wrong: Fans have to correct her, Books, Entertainment

Harry Potter author J.K. Rowling confirms theory about Hermione's name - NZ Herald

Mistakes in the Harry Potter books, Harry Potter Wiki

JK Rowling Admits Hermione Granger Should Have Ended Up With Harry Potter And Not Ron Weasley In The 'Harry Potter' Series

OK, We've Got Some Opinions About Harry Potter and the Cursed Child

What Fans Don't Know About Hermione Granger

Why does Rowling like Hermione so much? - Quora

Hermione Granger, Harry Potter Books Wiki

J.K. Rowling tells fan she had Hermione pronounce her name on purpose

Harry Potter: The Real-Life Inspirations Behind J.K. Rowling's Characters

J.K. Rowling regrets Hermione-Ron romance - Los Angeles Times