That's a good question, it's the French for Ariadne from Ancient Greek mythology. She delivered Theseus with a thread to come back home safely. Ariane launchers are the reliable thread linking Europe to space. 
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Replying to @Marswalkerr @esa
There's often an Ancient Greek/Roman mythology story underneath most of our products' names, for instance, do you know the name of our next engine?
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Is it the Vulcain 2.1?
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Vulcain 2.1 has an ancient roman mythology component indeed, it was the Roman God of fire, volcanoes, and metalworking.
But we were thinking about the latest born.
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Is it the Vinci engine?
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Vinci is the exception, can you guess who inspired us for this one (it's quite easy)?
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Replying to @WW141103006 @sixsilverstones and
Yes and also, all the engines that we develop in our Vernon (France) facility have a name starting with V (Vikink, Vulcain, Vinci) as a nod to the city.
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Replying to @ArianeGroup @sixsilverstones and
I see. Thanks for the info!
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Thanks for coming to Ariane launchers names 101. 
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Replying to @ArianeGroup @WW141103006 and
I swear I learned more from this one Twitter thread than a whole hour in history class
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