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Passiflora edulis
Planta leñosa perenne, hábito trepador y de rápido desarrollo. Sus hojas son simples, alternas, trilobuladas, con margenes aserrados, estipuladas y con un zarcillo en la axila. Flores hermafroditas, vistosas fragantes, solitarias y axilares.
What I know about the name ''maracuyá'', is that comes from the guarani's word ''mburucuja'' that means ''dipterous hammock'' because of the flower's sweetness and shape, specially atractive for those kinds of animals.
Regards!
Glad to know the Spanish name of the flower, since it's native to South America. Here's it's known as Passionflower (and produces passionfruit). My understanding is that the origin of the name comes from the three-fold radial symmetry of the center of the flower, calling to mind the Christian triumverate and hence the Passion of Christ. I agree that it's a stretch, but that's naming for you.