Did Atlas have a child?

Yes, in Greek mythology Atlas had many children, and his offspring are important figures in mythology. Atlas was a Titan, son of Iapetus and Clymene, and he married the Oceanid Pleione or in some accounts Aethra, and together they had numerous children. His most famous daughters are the Pleiades, the seven sisters named Maia, Electra, Taygete, Alcyone, Celaeno, Sterope, and Merope, who were placed in the sky as the Pleiades star cluster to escape Orion. Maia, the eldest Pleiades, was the mother of Hermes by Zeus, making Atlas the grandfather of Hermes. Atlas was also father of the Hyades, a group of nymphs associated with rain, and the Hesperides, the nymphs of the evening and golden light who guarded the golden apples in a garden at the edge of the world, often named as Aegle, Erytheia, and Hesperethusa. Additionally, Atlas had a son Hyas who was killed while hunting and whose sisters the Hyades mourned. In some traditions, Atlas was also father of Calypso, the nymph who detained Odysseus on her island Ogygia for seven years in Homer's Odyssey. Another daughter sometimes attributed to him is Dione. So Atlas had many children, primarily daughters who became star nymphs, and through them he is ancestor to many gods and heroes including Hermes.