The most important figure by this name, for there are many, is the half-brother of Siddhārtha. He is made central figure in a lengthy kāvya writing of Aśvaghoṣa.
Bhadanta Nanda. One of a group of 3 teachers Tāranātha calls 'Old Yogācāryas,' since they taught about the ālaya. They lived during the time of Nāgārjuna. Ghoshal & Dutt, THBI XV, p. 41.