Uṇmāda (Unmada) was mentioned as the son of lokabhābinī (lokabhabini or the woman who cares for people) Laṣmī (Lakshmi) and Nārāyaṇa (Narayana) in the Brahmāṇḍa Purāṇa (Brahmanda Purana). May be this name was metaphorically represented. Otherwise it was not told that the son of Uṇmāda (Unmada) was called Saṁśaya (Samsaya), which denoted a mental state. Just in the next śloka (sloka or poetic stanza) in the Brahmāṇḍa Purāṇa (Brahmanda Purana), the other sons of Laṣmī (Lakshmi) and Nārāyaṇa (Narayana) were called the mānasputra (Manasputra or psychological progeny)-
Tasyanye mānasah putrā.
So Uṇmāda (Unmada) actually implied a certain mental conditions in human beings.