The affix ṅīp necessarily comes in the chandas (Vedas) and in forming Names after that bahuvrīhi samāsa which ending in the syllable an loses its penultimate a,
This is an exception to the last rule; for while that enjoined the optional, the present enjoins the compulsory application of the affix ङीप् ॥ Thus सुराज्ञी 'the city called Surajni'; अतिराज्ञी 'the city of Atirajni'. Similarly in the Chhandas we have गौः पञ्चदाम्नी, एकदाम्नी, द्विदाम्नी 'a cow having five udders, one udder, or three udders'. एकमूर्ध्रा समानमूर्ध्री ॥,