An epithet of Māra. D.R. Shackleton Bailey, The Śatapañcāśatka of Mātṛceta, Cambridge University Press (Cambridge 1951), p. 169.
Murray Fowler, The Role of Surā in the Myth of Namuci, Journal of the American Oriental Society, vol. 62, no. 1 (March 1942), pp. 36-40. According to this, the name Namuci means 'Don't Let Go' or 'Hold Fast,' which explains why Buddhists use it as a name for Māra.
