Matrikas (Sanskrit: मातृका (singular), IAST: mātṛkā, lit. "mothers"), also called Mataras or Matri, are a group of mother goddesses in Hinduism. The Matrikas are often depicted in a group of seven, the Saptamatrika(s) (Seven Mothers). However, they are also depicted as a group of eight, the Ashtamatrika(s). They are associated with these gods as their energies (Shaktis). Brahmani emerged from Brahma, Vaishnavi from Vishnu, Maheshvari from Shiva, Indrani from Indra, Kaumari from Kartikeya, Varahi from Varaha and Chamunda from Chandi. And additionals are Narasimhi from Narasimha and Vinayaki from Ganesha.
Originally the seven goddesses of the seven stars of the star cluster of the Pleiades, they became quite popular by the seventh century CE and a standard feature of the Hindu goddesses's temples from the ninth century CE onwards. In South India, Saptamatrikas worship is prevalent whereas the Ashtamatrikas are venerated in Nepal, among other places.
View the full Wikipedia page for Vaishnavi (Matrika goddess)