प्राचामुपादेरडज्वुचौ च

Operational rule vidhi

According to the opinion of Eastern Grammarians the affixes अडच् and वुच् also come after a human name beginning with the word उप.

Word by word (padaccheda)

Target प्राचाम् ṣaṣṭhī · bahuvacanaLeft context उपादेः pañcamī · ekavacanaSubstitute / term अडच्- वुचौ prathamā · dvivacanaIndeclinable च avyaya

Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
Indeclinable An avyaya such as च "and", वा "optionally", न "not".

Dotted words are technical terms. Hover or tap one to see its card.

Full reading

प्राचाम् उपादेः अडच्-वुचौ च

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

As a rewrite rule (sketch from case endings)

प्राचाम् → अडच्- वुचौ / उपादेः

Replace prācām with aḍac-vucau when it comes after upādeḥ. Inherited words (anuvṛtti) may add further conditions.

Commentary

According to the opinion of Eastern Grammarians the affixes अडच् and वुच् also come after a human name beginning with the word उप।
The च shows that the former affixes also come. The sense of the affixes are the same as above viz. compassion or courtesy. Thus from the word उपेन्द्रदत्त, we have, 1. उपेन्द्रदत्तकः (kan), उपिकः (thach), 3, उपिलः (ilach), 4. उपियः (ghan), 5. उपकः (vuch), 6. उपडः (adach). The shortened forms are by 5.3.83. In diminutives, the forms are generally shortened. The word प्राचां is used as a sign of respect (pujartha), for the word वा was understood in the aphorism by anuvritti from 5.3.78.

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