This is the 351st most frequent Indonesian word.
anaknya
"Anaknya" means "his/her/their child" or "the child."
Here, 'anaknya' refers to someone's child, where '-nya' acts as a possessive pronoun denoting 'his/her'.
Anaknya rajin belajar setiap malam.
His/her child studies diligently every night.
In this sentence, 'anaknya' again means 'their child', with '-nya' indicating possession.
Orang tua itu memanggil anaknya untuk makan.
The elder called their child to eat.
Here, 'anaknya' speaks of 'his/her child', implying that the child is following the parent's path.