atraja : [adj.] born from oneself. (m.), a son. || atrajā (f.) a daughter.

A.P. Buddhadatta Mahathera, Concise Pali-English and English-Pali Dictionary [available as digital version from Metta Net, Sri Lanka]

Atraja (adj.) [Sk. *ātma -- ja, corrupted form for attaja (see attā) through analogy with Sk. atra "here". This form occurs only in J and similar sources, i. e. popular lore] born from oneself, one's own, appl. to sons, of which there are 4 kinds enumd., viz. atraja khettaja, dinnaka, antevāsika p. Nd2 448. -- J i.135; iii.103 = Nd1 504; J iii.181; v.465; vi.20; Mhvs 4, 12; 13, 4; 36, 57.

Pali-English Dictionary, TW Rhys Davids, William Stede,