Ὑδάσπης

From LSJ

ὁμοῦ ἦν καὶ ἔχειν τὴν πόλιν καὶ τὸ γένος ὅλον μετὰ τῆς πόλεως → it was much the same thing to have the city and to have the whole race together with the city

Source

Russian (Dvoretsky)

Ὑδάσπης: ου ὁ Гидасп (сев. приток Инда в Пенджабе) Plut.

Greco-Persian Names

Perhaps YAv. hu-δāta, well-made, well-formed + APers. aspa (comp.), horse, Av. aspa, Skt. açva; having well-formed horses; cf. Justi, NB. 131.