The Vesper Martini was invented and named by Ian Fleming in the 1953 James Bond novel Casino Royale.
"A dry martini," [Bond] said. "One. In a deep champagne goblet."
"Just a moment. Three measures of Gordon's, one of vodka, half a measure of Kina Lillet. Shake it very well until it's ice-cold, then add a large thin slice of lemon peel. Got it?"
"Certainly, monsieur." The barman seemed pleased with the idea.
"Gosh, that's certainly a drink," said Leiter.
Bond laughed. "When I'm...er...concentrating," he explained, "I never have more than one drink before dinner. But I do like that one to be large and very strong and very cold and very well-made. I hate small portions of anything, particularly when they taste bad. This drink's my own invention. I'm going to patent it when I can think of a good name."
—Ian Fleming, Casino Royale, Chapter 7, "Rouge et Noir'
Bond in the next chapter, "Pink Lights and Champagne", names it the Vesper. At the time of his first introduction to the beautiful Vesper Lynd he obtains her name in a perfect interrogation indirecte, "I was born in the evening,..on a very stormy evening..," and asks to borrow it.
Come and try our Vesper Martini and enjoy the wonderful views over Cambridge