-ους, ὁ Arnapes persa X.HG 1.3.12.
APers. *arana (cf. hamarana, battle, YAv. hamarəna, Skt. samarana), fr. ar, to set in motion + YAv. pā, protecting, sustaining; cf. -πης in σατράπης, APers. xšaθrapāvan, satrap, kingdom-sustaining.