I’m just double checking the declension class for ευμμελιης. There’s about 50 nouns, most proper names, whose nominative singular ends in ης and whose genitive singular ends in αο. But what about the contracted form of αο which is ω? Well, I can find very few of those nouns, but I have found one: ευμμελιης. Here’s what my stats show for how ευμμελιης is terminated:
ευμμελιην 18
ευμμελιης 20
ευμμελιω 13
ευμμελιαι 2
ευμμελιηι 2
Although the word ευμμελιω appears 13 times it turns out that it’s the same sentence quoted over and over again by different authors. It’s an epithet of Priam in Homer. I’m almost certain that it’s genitive but I want to double check:
Aelius Herodianus, De prosodia catholica:
ἐὰν γὰρ πάθωσι , πρὸ μιᾶσ τοῦ τέλουσ ἔχουσι τὴν ὀξεῖαν οἷον Ἑρμείου Ἑρμείεω καὶ κατὰ συγκοπὴν Ἑρμείω παροξυτόνωσ « Ἥρησ Ἑρμείω τε » ( Ο 214 ) , Ἀσίασ Ἀσίου καὶ Ἰωνικῶσ Ἀσίεω καὶ Ἀσίω ὡσ εὐμμελίω « Ἀσίω ἐν λειμῶνι »
Translated as:
For if they are affected [i.e. inflected], they have before the final syllable a sharp accent (oxytone), like Ἑρμείου [genitive of Hermes] from Ἑρμείας, and in syncopated form Ἑρμείω, with an oxytone accent: ‘of Hera and of Hermes’ (Iliad 15.214); likewise Ἀσίας [from Ἀσία] becomes Ἀσίου, and in Ionic Ἀσίεω and Ἀσίω, as in εὐμμελίω [‘spear-famed’], ‘Ἀσίω ἐν λειμῶνι’ [‘of Asius in the meadow’].”
And here:
τῆς ποτε χρυσοφόρου δειρῆς , ὡς τὸ ἐυμμελίω Πριάμοιο : Scholia in Euripidem -49 Scholia in Euripidem (scholia vetera)
Translated as:
of the once gold-adorned neck, as in ‘εὐμμελίω Πριάμοιο’
I initially thought that τὸ would make εὐμμελίω nom/acc neuter but it refers to the expression, not the word.
And then the original Homeric context from the Iliad
ἔσσεται ἦμαρ ὅτ᾽ ἄν ποτ᾽ ὀλώλῃ Ἴλιος ἱρὴ καὶ Πρίαμος καὶ λαὸς ἐϋμμελίω Πριάμοιο
6.447
There will be a day when sacred Ilios shall perish, and Priam, and the people of Priam, famed for their good spears.
In conclusion the declension of ἐϋμμελίω is
sn ἐϋμμελίης
sg ἐϋμμελίω
sd ἐϋμμελίῃ
sa ἐϋμμελίην
pn ἐϋμμελίαι
pg ἐϋμμελίων
pd ἐϋμμελίαις
pa ἐϋμμελίας
Let me know if I made any mistakes.