Sarupa, the wife of Bhuta, gave birth to the ten million Rudras, of whom the eleven principle Rudras were Raivata, Aja, Bhava, Bhima, Vama, Ugra, Vrsakapi, Ajaikapat, Ahirbradhna, Bahurupa and Mahan

Expressions researched:
"Sarupa, the wife of Bhuta, gave birth to the ten million Rudras, of whom the eleven principle Rudras were Raivata, Aja, Bhava, Bhima, Vama, Ugra, Vrsakapi, Ajaikapat, Ahirbradhna, Bahurupa and Mahan"

SB Canto 6

Sarūpā, the wife of Bhūta, gave birth to the ten million Rudras, of whom the eleven principle Rudras were Raivata, Aja, Bhava, Bhīma, Vāma, Ugra, Vṛṣākapi, Ajaikapāt, Ahirbradhna, Bahurūpa and Mahān. Their associates, the ghosts and goblins, who are very fearful, were born of the other wife of Bhūta.

SB 6.6.17-18, Translation and Purport:

Sarūpā, the wife of Bhūta, gave birth to the ten million Rudras, of whom the eleven principle Rudras were Raivata, Aja, Bhava, Bhīma, Vāma, Ugra, Vṛṣākapi, Ajaikapāt, Ahirbradhna, Bahurūpa and Mahān. Their associates, the ghosts and goblins, who are very fearful, were born of the other wife of Bhūta.

Śrīla Viśvanātha Cakravartī Ṭhākura comments that Bhūta had two wives. One of them, Sarūpā, gave birth to the eleven Rudras, and the other wife gave birth to the associates of the Rudras known as the ghosts and hobgoblins.