Though it may not be as sweet and gentle as, say, Violet, the purple-hued Hyacinth still might hold some appeal for the parent seeking a truly exotic flower name.
In Greek mythology Hyacinthus was a Spartan youth accidentally killed by Apollo, from whose blood sprang a beautiful and fragrant flower, and it is also the name of several saints; Hyacinth became exclusively female in the nineteenth century. To the ancients Hyacinth was, in addition to being a bluebell-like blossom, the name of a precious stone .
There is a character named Hyacinth Robinson in Henry James's The Princess Casamassima and Hyacinth Bucket is the social climbing character on the British sitcom Keeping Up Appearances, with sisters named Daisy, Rose and Violet.
You might also consider the Spanish version, Jacinta.