Ūrjjā (Urjja) is one of the fourteen gaṇa (gana; genus) of Apsarās (Apsara; celestial coutesan). From this Ūrjjā, emerged the Agnisambhava gaṇa of the Apsarās.

Vāyupurāṇa(69.54)
Brahmāṇḍapurāṇa (Maharṣi)(2.7.19)