genitive plural (ñātamanussa + nominative plural marker -ānañ/aṁ)
Analysis. ñāta (past participle of ñānāti 'knows') + manussa (human being); 'known humans', i.e. relations and close acquaintances. The form is a bahuvrīhi or tatpuruṣa compound.
Etymology. ñāta from √ñā (to know), cognate with Latin gnōscere (know), Greek gnōsis (knowledge), English know; manussa from Indo-European *man- (man, mind), seen in man, Latin manus (hand, as in 'handled by mind'). The compound idiomatically denotes family members and people of one's circle.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
Lite mode — plain HTML for e-readers and old browsers. Full version