Ἕρκυνα
Could not find Ἕρκυναν in Logeion dictionaries.
Ἕρκυναν Proper-name noun: feminine accusative singular of Ἕρκυνα
Ἕρκῡνα or -υννα, ἡ, title of Demeter at Lebadea, Lyc. 153:— hence Ἑρκύνια (-κήνια cod.), τά, festival of Demeter, Hsch.
Ἕρκυνα, v. Ἕρκυννα.