(in short) What's the epigraphical support to the Aeolian word ἴκκος ? I can't find it in the (very limited) data I can consult.
(full story) The history of the Greek word ἵππος ("horse") can be tracked down to the Mycenaean Greek, see e.g. tablet PY Ta 722/DMG 246.1 : "i-qo-qe".
Unexpected initial aspiration (at least in Attic), unexpected initial vowel, geminate consonant : the exact story of the word is obscure (see e.g. D. Gary Miller, Ancient Greek Dialects and Early Authors, p. 299).
The Aeolian form "ἴκκος" is broadly cited but I can't find whence it came. What's its epigraphical source ? E.g. the site epigraphy.packhum.org, as far as I know, doesn't know it. Is it a word cited by a Greek author ? Plato knew the name Ἴκκος (e.g. in Protagoras 316d).
Alas, I don't have access to Ernst Schwentner's "Griech. ἳππος und ἴκκος".
Any help, any reference would be appreciated !