SB 6.5.1

śrī-śuka uvāca
tasyāṁ sa pāñcajanyāṁ vai
 viṣṇu-māyopabṛṁhitaḥ
haryaśva-saṁjñān ayutaṁ
 putrān ajanayad vibhuḥ
Word for word: 
śrī-śukaḥ uvāca — Śrī Śukadeva Gosvāmī said; tasyām — in her; saḥ — Prajāpati Dakṣa; pāñcajanyām — his wife named Pāñcajanī; vai — indeed; viṣṇu-māyā-upabṛṁhitaḥ — being made capable by the illusory energy of Lord Viṣṇu; haryaśva-saṁjñān — named the Haryaśvas; ayutam — ten thousand; putrān — sons; ajanayat — begot; vibhuḥ — being powerful.
Translation: 
Śrīla Śukadeva Gosvāmī continued: Impelled by the illusory energy of Lord Viṣṇu, Prajāpati Dakṣa begot ten thousand sons in the womb of Pāñcajanī [Asiknī]. My dear King, these sons were called the Haryaśvas.