The vaṁśa (vamsa; genealogical line) of Maharṣi (Maharshi; Great Sage) Udvalāyana(Udvalayana) is one of the ṛṣivaṁśa(s) belonging to the clan of Maharṣi Kaśyapa(Kasyapa) , mentioned in Purāṇa (Purana). Udvalāyana was one of the founder-figures of the clans belonging to Kaśyapa.