pakzu
Pakṣu , n. of a nāga king: °ur Mvy 3307 . Cf. Vakṣu . Tib. Pag-śu . But it seems to be a river-name; the three preceding names are Gaṅgā-, Sindhur, and Sītā-nāgarājā; similarly in MSV i.164.1 . (Nāgas are often thought of as living in rivers, as is well known; cf. Mvy 3304—6 .) Since Vakṣu occurs as n. of a river in Skt. , it is probably the correct form.