Sri Matre Namaha
Nirbhavā – The One Hundred & Seventy Fourth name in Lalitha Sahasranamam.
nirgatah bhavah (=utpattih) yasyah sa
She is without origin.
Nirbhavā: Nir means nil / nothing / no position and Bhava means Stucture,
that means there is no structure; when there is no structure then there is no origin
In short since She is Anantha hence “The Supreme Brahman is without origin”
She is ‘aadhi’ (first) and ‘anadhi’ (without parentage). It is generally said that Shiva is without origin as nobody has created Him. Here Lalitha is said to be without origin because there is no difference between Her and Shiva. Their unified form is called as the Brahman.
Kṛṣṇa says (Bhagavad Gīta XIII.12), that Brahman is beginning-less and this statement of Krishna is confirmed by almost all the Upanishads.
“That supreme neither Brahma, who is the lord of beginningless entities, is said to be neither Sat (being, existing) nor Asat (unreal, non-existing). This saying of Kṛṣṇa has conceptualised the crux of all the Upaniṣads. “