Iacchos, mystic name of Dionysus, S. Fr. 959, Trag.Adesp. 140 (lyr.), Ar. Ra. 398, Paus. 1.2.4, etc.; ἡ Ἐλευσῖνι τοῦ Ἰαάκχου (sic) ὑποδοχή IG 2(2).847.21; τὸν Ἴακχον ἐξελαύνειν lead forth a Bacchic procession, Plu. Alc. 34; τὸν Ἴ. προπέμψαι IG 2(2).1028.10.
song in his honour, ὁ μυστικὸς ἴ. Hdt. 8.65, cf. Athenio ap. Posidon. 36 J., Anon. ap. Suid.; ᾄδειν τὸν Ἴ. Hsch. s.v. Διαγόρας: as Adj., ἴακχος ᾠδά E. Cyc. 69 (lyr.).
in pl., Epigr.Gr. 985 (Philae): generally, chorus, νεκρῶν ἴ. E. Tr. 1230; τυμπάνων ἴ. dub. in Id. Fr. 586.4L (lyr.).
used by the tyrant Dionysius for χοῖρος, Athanis 1 ( = Dionys.Trag. 12).