Of course, this is not a proper name, but refers to a group of 12 Sugatas.
Bibliography:
Mahāmudrābhigīti (Phyag rgya chen po brda'i brgyud pa). Tôh. no. 2439. Dergé Tanjur, vol. ZI, folios 50r.1-55v.7. Tr. by Na gu (i.e., Pha dam pa Sangs rgyas) and Zha ma Lo tsā ba. Included in Pha dam pa Sangs rgyas collection.
Dergé colophon: bde bar gshegs pa lung gi brgyud pa yi dam gyi lhas bstan pa 'dzam bu'i gling du sngon chad ma grags pa'o // sangs rgyas gnyis pa ltar grags pa bla ma rgya gar nag gu'i zhal snga nas bod kyi bande zha ma lo tsā bas byin rlabs kyi gnas mchog ding rir bsgyur te / bla ma byang chub sems dpa' kun dga' la gtad pa rdzogs so.
