Pāṇini sūtras

In a stem ending in n the preceding vowel is lengthened before the affix nām

German Bei einem auf n auslautenden Stamme wird der vorangehende Vocal vor nām verlängert. (7)

1. na+upadhāyāḥन+उपधायाः

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   nन्	naन	naन	nakāraनकार	nन् + plus aअ
   uउ	upadhāउपधा	upadhāyāḥउपधायाः	penult	upadhउपध् + plus āyआय्

Anuvṛtti

1. nāmiनामि 6·4·3

   Part	Lexeme	Sandhi form	Meaning	Stem + termination
   nन्	nāmनाम्	nāmiनामि	nāmनाम्	nāmनाम् + plus iइ