According to the Zoroastrian cosmogony, Mashya /mæʃjɒ/ and Mashyana /mæʃjɒnɛ/ were the first man and woman whose procreation gave rise to the human race.
The names are from Avestan, nominally transliterated as mašyā and mašyānē, but like other Avestan words also, spellings (and hence transliterations) vary from manuscript to manuscript. Mašyā may thus also appear as maṣ̌iiā or maš́iiā or mašiiāi (and variants).
Originally and etymologically, Mašyā means "mortal being" as Old Persian martya, Persian mard and even Sanskrit martya also mean "mortal" and therefore "man". The root in Avesta and Sanskrit for death is mar, mr, "to die". The causative mâr means "to kill". Its derivatives merethyu/mrtyu means "death"; mareta and maretan means "mortal", and then "man, human being" mashya. For more on the etymology of the aša and arta variants of these terms, see Avestan phonology.
According to the creation myth as described in the Bundahishn, Ohrmuzd's (Ahura Mazda) sixth creation is the primeval beast Gayomart (Gayamarətan), who was neither male nor female. Ahriman (Angra Mainyu), the Spirit of Evil that dwelt in the Absolute Darkness, sought to destroy all that Ohrmuzd had created, and sent the demoness Jeh (Jahi) to kill Gayomard. In this she was successful, but the moon (Mah) captured his seed before the animal died, from which all animal life then grew. From Gayomard's corpse grew a tree, the seeds of which were the origin of all plant life, and from the branches of which grew Mashya and Mashyana.