I was requested to employ my “Mata Hari wiles” to get some information about something yesterday. I didn’t know the reference then, but now I do:

Mata Hari. Behind the patina of the pseudonym Mata Hari (“Eye of the Dawn”) is a rather prosaic Dutch name. Margaretha Geertruida Zelle (1876-1917) used Mata Hari as both her stage name and nom de guerre when she chose to become a spy for the Germans before World War I. Acclaimed throughout Europe for her interpretations of naked Indonesian dances, she met many men in high places, including German officials in Berlin who recruited her as a spy in 1907. During World War I, her dancing was the rage of Paris and she became intimate with top Allied officers, who confided military secrets to her. Mata Hari, who slept with literally hundreds, thrived on the deceit of espionage, but she was eventually betrayed to the French secret service by another German agent, Captain Walther Wilhelm Canaris, later to become head of the German secret service in World War II. Her trial was the most publicized of the many espionage trials held during the war, and her name became synonymous with a glamorous female spy and femme fatale. She was convicted by a French court-martial ane executed by a firing squad.
The Facts on File Encyclopedia of Word and Phrase Origins, Third Edition, Robert Hendrickson

That’s kinda cool for this esoteric belly dancing German-speaking wiley fraulein.