4.2.112
इञश्च
Operational rule vidhi
After a family-name formed by इञ् the affix अण् is added in the remaining senses.
Word by word (padaccheda)
Left context इञः pañcamī · ekavacanaIndeclinable च avyaya
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
- Indeclinable An avyaya such as च "and", वा "optionally", न "not".
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Full reading
इञः च
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
After a family-name formed by इञ् the affix अण् is added in the remaining senses.
This debars अण् ॥ Thus from दक्ष we have Patronymic दाक्षि, from which दाक्षाः "the pupils of Dakshi" ; प्लाक्षाः, माहकाः ॥ The final इ is elided before अण् by 6.4.148.
Why do we say 'denoting a family-name'? Observe सौतङ्गमिः, a word formed by इञ् of 4.2.80, not denoting a family, but having the four-fold sense of 4.2.68 - 4.2.70. The further derivative from this will be सौतङ्गमीयम् by छ 4.2.114.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.