नाम्न्यादिशिग्रहोः

Operational rule vidhi

The affix णमुल् comes after the verbs 1. आदिश् 2. ग्रह् 'to seize' when the word नामन् 'name' in the Accusative -2nd case is in composition.

Word by word (padaccheda)

Right context नाम्नि saptamī · ekavacanaTarget आदिशि- ग्रहोः ṣaṣṭhī · dvivacana

Right context Saptamī (7th case): "when X follows", the operation applies to what precedes (1.1.66 तस्मिन्निति निर्दिष्टे पूर्वस्य). Also a condition or domain ("in the sense of").
Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).

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Full reading

नाम्नि आदिशि-ग्रहोः

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

The affix णमुल् comes after the verbs 1. आदिश् 2. ग्रह् 'to seize' when the word नामन् 'name' in the Accusative -2nd case is in composition.
Thus नामादेशमाचष्ठे 'he mentions it, telling his name'. नामग्राहं मामाहूयति 'he calls me by taking my name (i.e. by my name)'.

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.