Semitic Etymological Database
The meaning of Akk. nâpu, translated as ‘schwanken’ in AHw. 742, is highly uncertain (cf. CAD N₁ 327) which makes its comparison rather problematic (Kogan 2015:566).
Lower-level reconstructions
Words
Likely ultimately related to this root (originally “to swing over something”?): Kogan 2015:566.