Before a taddhita affix having an indicatory ñ , ṇ or k the vṛddhi is not substituted for the first vowel in a compound when it follows a word ending in y or v but ai and au are respectively placed before the semi-vowels.,
As कैकेयः (= केकयस्यापत्यं), with the affix अञ् 4.1.168: similarly मैत्रेयिका formed with वुञ् 5.1.134 in the sentence मैत्रेयिकया श्लाघते ॥ The word Gotra in that sutra 5.1.134 means a Rishi name, for in ordinary parlance the name of a Rishi is called Gotra. Similarly प्रालेयम् (= प्रलयादागत). As प्रालेयमुदकं ॥,