pꜣ-sbꜣ-ḫꜥ-n-nwt

Etymology
, thus literally ‘the star appearing in the city’, a reference to Thebes.

Greek reflects the later (Demotic-era) shift of /ḫ/ → [ʃ] in [pəsiβʃəʕənˈneːʔə]. The preposition appears as  due to assimilation with.