So you want a royal name, that is linked to some 'sick and perverted evilish story'.... *taps his chin* 
WARNING: TEXT WALLS!
I still remember some names who were rather... excentric in their way of living:________________________________________________________________________
She is Slovak to, so is Daiders... and if you read closely they have much in common *scared*Countess Elizabeth Báthory (Báthory Erzsébet in Hungarian, Alžbeta Bátoriová in Slovak, Alžběta Báthoryová in Czech, Elżbieta Batory in Polish, August 7, 1560 – August 21, 1614) was a countess from the renowned Báthory family. She is possibly the most prolific female serial killer in history and is remembered as the "Blood Countess" and as the "Bloody Lady of Čachtice", after the castle near Trencsén (today Trenčín) in the Kingdom of Hungary, (today's Slovakia), where she spent most of her adult life.
After her husband's death, she and four collaborators were accused of
torturing and killing hundreds of girls and young women, with one witness attributing to them
over 600 victims, though the number for which she was convicted was 80. In 1610, she was imprisoned in the Csejte Castle, where she remained bricked in a set of rooms until her death four years later.
The case has led to legendary accounts of the Countess
bathing in the blood of virgins in order to retain her youth and subsequently also to comparisons with Vlad III the Impaler of Wallachia, on whom the fictional Count Dracula is partly based, and to modern nicknames of the Blood Countess and Countess Dracula.
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Madame de Montespan
Françoise-Athénaïs de Rochechouart de Mortemart, Marchioness of Montespan (5 October 1641 – 27 May 1707), better known as Madame de Montespan, was one of the most celebrated maîtresse-en-titre of Louis XIV of France
In 1
666, Madame de Montespan supposedly went so far as to allow a priest, Etienne Guibourg, to perform a
black mass over her nude body in a
blood-soaked ceremony, which was also said to have
included infant sacrifice. Whatever the truth in these allegations, in July 1667, Madame de Montespan became the king's new mistress even though Louise was carrying his child, Louis de Bourbon, comte de Vermandois.
Allso she was involved in the
Poison Affair, a murder scandal in France during Louis XIV's period. It involved
poison and witchcraft.
It's been said that Madame de Montespan had relations with a lady called 'La Voisin' who made love potions for her. Madame de Montespan mixed these love potions in Louis XIV's dinner so that he would love her more. Nonetheless these 'love potions' were
made by baby foetuses and other witchy ingredients.
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Vlad III, Prince of Wallachia (c. 1431 – December 1476), more commonly known as the Impaler (Romanian: Vlad Ţepeş pronounced [ˈvlad ˈt͡sepeʃ]) or Dracula, was a three-time voivode of Wallachia, ruling mainly from 1456 to 1462.
Methods of execution
Woodblock print of Vlad the Impaler dining in the presence of numerous impaled corpses
When he came to power Vlad ruled with the intent to gain vengeance on the boyars for killing his father and eldest brother. Though Vlad took nearly a decade to do so, he fulfilled this vow, completing the task on an Easter Sunday around 1457.
The older boyars and their families were immediately impaled. The younger and healthier nobles and their families were marched north from Târgovişte to the ruins of Poienari Castle in the mountains above the Argeş River, 40 miles north of Târgovişte. Vlad was determined to rebuild this ancient fortress as his own stronghold and refuge so he may monitor the movements of the Hungarians coming through Transylvania and the Turks of the Ottoman Empire. The enslaved boyars, their families and some master masons were forced to labor until their deaths, rebuilding the old castle with materials from another nearby ruin. According to tradition, they laboured until the clothes fell off their bodies and then were forced to continue working naked. None survived the construction of castle Poienari, as those who did not die from exhaustion were impaled.
Vlad the Impaler's reputation was considerably darker in Western Europe than in Eastern Europe and Romania. In the West, Vlad III Ţepeş has been characterized as
a tyrant who took sadistic pleasure in torturing and killing his enemies. The number of his victims ranges from 40,000 to 100,000. According to the German stories the number of victims he had killed was at least 80,000. In addition to the 80,000 victims mentioned he also had whole villages and fortresses destroyed and burned to the ground. These numbers are most likely exaggerated.
The atrocities committed by Vlad in the German stories
include impaling, torturing, burning, skinning, roasting, and boiling people, feeding people the flesh of their friends or relatives, cutting off limbs, and drowning. All of these punishments mainly came from things people did that displeased Vlad the most; stealing, lying, and adulterous relations with his wife.
Other methods of punishment included skinning the feet of thieves, then putting salt on them and letting goats lick off the salt. This was a way that Vlad kept his people in order and
taught them that stealing will not be tolerated in his lands. No exceptions were made: he punished anyone who broke his laws, whether men or women, no matter the age, religion or social class.
We should use such practices with the Provocateurs!_______________________________________________________________________
Saint Gilles de Rais, Seigneur and Baron de Retz (1404 – 1440), was a Breton knight, the companion-in-arms of Joan of Arc, and a Marshal of France, but is best known as a
prolific serial killer of children.
Shortly after, Gilles moved to Machecoul where, as the record of his confession states, he
killed, or ordered to be killed, a great but uncertain number of children after he committed sodomy upon them. Forty bodies were discovered in Machecoul in 1437.
The victims were
killed by either decapitation, cutting their throats, dismemberment, or by breaking their necks with a stick. A short, thick, double-edged sword called a braquemard was kept at hand for the murders.
I did not want to post all of the details on Gilles de Rais as it was to sick imo. But you can always read the Wikipedia if you really want to read that shit.___________________________________________________________________
So the names are royal and evilish enough for you? 
I´ve always loved the legend around her.. nobody realy knows what is true and what´s not from it. Although they tried oto figure it out, it was too hard to determine whether she was realy the biggest female serial killer of Europe, or rather a victim of her time..