The affix ñya comes after the name of a wild band after a word ending in cphāñ -- gotre kuñjādibhyaścphañ [[4.1.98]], without change of sense, but not in the feminine.,
A collection of persons of different castes, having no determined livelihood, and living by violence are called व्रात or 'wild band'. Thus कपोतपाक्यः 'a wild band living of pigeons', कपोतपाक्यौ and कपोतपाकाः, व्रैहिमत्यः, व्रैहिमत्यौ, pl. व्रीहिमताः ॥ So with words ending in च्पञ्, as कौञ्जायन्यः, कौञ्जायन्यौ, pl. कौञ्जायनाः, ब्राध्नायन्यः ब्राध्नायन्यौ pl. ब्राध्नायनाः ॥
Why do we say
ot in the Feminine ?\ Observe कपोतपाकी, व्रीहिमती, कौञ्जायनी, ब्राध्नायनी ॥,