sandhi contraction (interrogative)
Analysis. ko (interrogative pronoun 'who, what') + nāmo (nominative singular of nāman 'name'). The final -o of ko assimilates before the initial n- of nāmo, creating the contraction konāmo; the phrase is used as an attributive interrogative meaning 'what name?' or 'what is called?'
Etymology. ko derives from PIE *kwo- (cognate with English who, Latin quī); nāmo from PIE *h₃neh₃-men- (cognate with English name, Latin nōmen, Sanskrit nāman). The interrogative ko regularly contracts with following vowel-initial words in sandhi.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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