Achiroe

Achiroë (Ἀχιρόη ), Anchirrhoë (Ἀγχιρρόη), or Anchinoë (Ἀγχινόη), which is perhaps a mistake for Anchiroë, was in Greek mythology an Egyptian naiad, as daughter of the river-god Nilus. She was the wife of King Belus of Egypt, by whom she became the mother of Aegyptus and Danaus, and, according to some accounts, Cepheus, and Phineus.

Otherwise, the possible mother of these children and spouse of Belus was called Side, eponym of Sidon in Phoenicia.

Mythology
Anchinoe was a minor figure in Greek accounts and only mentioned by Apollodorus in his Bibliotheca:


 * “But Belus remained in Egypt, reigned over the country, and married Anchinoe, daughter of Nile, by whom he had twin sons, Egyptus and Danaus, but according to Euripides, he had also Cepheus and Phineus.”