nominative plural pronoun (sandhi form mayampi = mayaṃ + api)
Analysis. mayaṃ (first person plural nominative of ahaṃ, 'we') + api (emphatic particle 'also, too, even'). The sandhi contraction mayampi shows the final ṃ of mayaṃ assimilating before the initial a of api.
Etymology. ahaṃ is the first person singular nominative pronoun, cognate with Sanskrit aham and the Indo-European root *eg- (English 'I', Latin 'ego', Greek 'ego'). The plural form mayaṃ is the inclusive 'we'; api is an enclitic particle meaning 'also' or 'even', from the Indo-European root *ap- (Latin 'apt', Greek 'apt').
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
Lite mode — plain HTML for e-readers and old browsers. Full version