Also called Guṇākarabhadra. Note that Guṇaprabha, q.v., is also represented in Tibetan by Yon tan 'od.
See Kosambi and Gokhale, Subhāṣitaratnakoṣa, p. lxxvi.
Jean Filliozat, ed. and tr., Yogaśataka: Texte médical attribué à Nāgārjuna, Publications de l'Institut Française d'Indologie no. 62, Institut Français d'Indologie (Pondichéry 1979), p. xiv. He composed his commentary on the Yogaratnamālā (attributed to Nāgārjuna) in 1239.
See the entry "Gunaprabha" at http://www.rigpawiki.org, which includes a painting.
Bibliography:
Āścaryayogamālā.
Moriguchi, p. 16. The author's name in full is Śrī Śvetāmbarapaṇḍita Guṇākara. This might suggest that he belonged to a branch of the Jaina religion (Śvetāmbara means 'White Clothed').
On what would seem to be a Indian manuscript found at Sa skya Monastery, see Dge 'dun chos 'phel, Works, vol. 1, p. 32.