Names, unlikely nouns, have only one reference: a single person. Therefore, you should only use them if you know whom they identify. But in ancient texts, there are names without a clear person meant and designed by : these names show a veiled character, often made of mythical stuff, frightening and evanescent. Although, authors try to give sense to these strange sounds and therefore dark representations by looking for correspondences with other words which meanings are clear, and by putting them together: analogy and likeness become equation. The strange name of « Hellequin » will give us the occasion to examine these remarkable games, showing how old mythical shades can become authentic characters and individuals in poetry, theatre and novel.