Erzsébet

Empress Elisabeth of Austria, Queen of Hungary, was called Erzsebet Kiralyne in Hungarian. Her granddaughter Elisabeth was called "Erszi" as a tribute.

Well, Erzsébet Báthory is most commonly known as Elizabeth Báthory. She's only known by her Hungarian name in academic circles and in Hungary, so naming your kid Erzsébet but not after Erzsébet Báthory is like naming your kid Lizzie, but not after Lizzie Borden.

Erzsebet was the name of the "female Dracula," a countess who bathed in the blood of virgins to make herself look youthful. She was convicted of the deaths of 612 women in 1611 and died under house arrest three years later.

Countess Erzsébet Báthory of 15th century Hungary was an infamous bearer of this name. Sadistic and vain, she indulged in the torture and death of over 600 maidens to gain their youth, vitality and beauty. She was never charged with her crime and was walled up within her castle, where she died several years later.

Let's not be hasty here. The countess Bathory did not murder the girls, as is commonly believed, for their beauty. It might have been a minor motivation, true, but the primary one is sadism. She was not particularly discriminate in who she killed, you see - if a girl ever made a mistake dressing her, for instance, they'd be put in front of a specially designed iron maiden whether or not they were pretty. In short, she was just sadistic and twisted, not necessarily vain.