Today we will look at the form कौरव्य mVs from श्रीमद्भागवतम् Sb10.42.32.

व्युष्टायां निशि कौरव्य सूर्ये चाद्भ्यः समुत्थिते ।
कारयामास वै कंसो मल्लक्रीडामहोत्सवम् ∥ १०-४२-३२ ∥

श्रीधर-स्वामि-टीका
कष्टेन कथंचित्प्रभातायां पुनः सूर्ये चाद्भ्यः समुत्थित इति । तथा च श्रुतिः – ‘अद्भ्यो वा’ इति – ‘य उदगान्महतोऽर्णवात्, विभ्राजमानः सलिलस्य मध्यात् ∥ स मा वृषभो लोहिताक्षः सूर्यो विपश्चिन्मनसा पुनातु’ इति च ∥ ३२ ∥

Gita Press translation “When the night passed and the sun rose from the (eastern) waters, O scion of Kuru, Kaṁsa actually had a grand festival of wrestling bouts to be celebrated.”

The above verses have previously appeared in the following post – अद्भ्यः-f-ab-s

कुरवो जनपदः, कुरुर्नाम क्षत्रियः। कुरोरपत्यम् (पुमान्) = कौरव्यः – a (male) descendant of a kṣatriya king named Kuru, which is also the name of his territory. Here it refers to king Parīkṣit.
Note: As a convention in the language, words (such as ‘कुरु’) while denoting a territory are always used in the plural.

In the verses the विवक्षा is सम्बुद्धिः। Hence the form is कौरव्य।

(1) कुरु ङस् + ण्य । By 4-1-172 कुरुनादिभ्यो ण्यः – To denote the sense of अपत्यम् (descendant) the तद्धित: affix ‘ण्य’ may be applied optionally following a syntactically related पदम् which ends in a sixth case affix and has as its base ‘कुरु’ or a word beginning with the letter ‘न्’ provided the base denotes the name of a kṣatriya king, as well as the name of his country/territory.
Note: Here, the affix ‘ण्य’ over-rules the affix ‘अण्’ that would have been prescribed by 4-1-170 द्व्यञ्मगधकलिङ्गसूरमसादण्।
As per the सूत्रम् 4-1-92 तस्यापत्यम् – Following a syntactically related पदम् in which the सन्धिः operations have been performed and which ends in a sixth case affix the तद्धिता: affixes already prescribed (by the prior rules 4-1-83 प्राग्दीव्यतोऽण् etc), as well as those that are going to be prescribed (by the following rules 4-1-95 अत इञ् etc), may be optionally applied to denote the sense of अपत्यम् (descendant.)

(2) कुरु ङस् + य । अनुबन्ध-लोपः by 1-3-7 चुटू, 1-3-9 तस्य लोपः।
Note: ‘कुरु ङस् + य’ gets the designation प्रातिपदिकम्‌ by 1-2-46 कृत्तद्धितसमासाश्च। This allows 2-4-71 सुपो धातुप्रातिपदिकयोः to apply in the next step.

(3) कुरु + य । By 2-4-71 सुपो धातुप्रातिपदिकयोः – A सुँप् affix takes a लुक् elision when it is a part of a धातुः or a प्रातिपदिकम्।
Note: The affix ‘ण्य’ is a णित् (has the letter ‘ण्’ as इत्)। This allows 7-2-117 तद्धितेष्वचामादेः to apply in the next step.

(4) कौरु + य । By 7-2-117 तद्धितेष्वचामादेः – The first vowel among the vowels of a अङ्गम् which is followed by a तद्धित: affix (ref. 4-1-76 तद्धिताः) which is either a ञित् (has the letter ‘ञ्’ as a इत्) or a णित् (has the letter ‘ण्’ as a इत्) takes the वृद्धि: (ref. 1-1-1 वृद्धिरादैच्) substitute.
Note: The अङ्गम् ‘कौरु’ gets the भ-सञ्ज्ञा by 1-4-18 यचि भम् which allows 6-4-146 ओर्गुणः to apply in the next step.

(5) कौरो + य । By 6-4-146 ओर्गुणः – When followed by a तद्धितः affix, the ending letter ‘उ’/’ऊ’ of a अङ्गम् which has the भ-सञ्ज्ञा (ref. 1-4-18 यचि भम्) takes the गुण: substitution (‘ओ’)।

(6) कौरव् + य । By 6-1-79 वान्तो यि प्रत्यये – When followed by an affix which begins with the letter ‘य्’, the letters ‘ओ’ and ‘औ’ are replaced by ‘अव्’ and ‘आव्’ respectively.

= कौरव्य । Note: The प्रातिपदिकम् ‘कौरव्य’ declines like राम-शब्दः।