The name of Manu’s son was Aṅga (Anga). Antardhāmā (Antardhama)was the son of Aṅga. Havirdhāmā (Havirdhama), son of Antardhāma is hailed as a Prajāpati (Prajapati; Ruler of the people).

Mahābhārata (Kinjawadekar)(13.147.23-24)
Mahābhārata Vols. 1-43 (Siddhāntabāgīśa)(13.125.23-24)