Usage: 4 forms in 7 verses
Form Translated As     In Verse(s)
αρχιευνούχω his chief eunuch LXX.Dan.1.3
αρχιευνούχου chief eunuch LXX.Dan.1.9
αρχιευνούχοσ chief eunuch LXX.Dan.1.7LXX.Dan.1.10LXX.Dan.1.11LXX.Dan.1.18
αρχιευνούχον chief eunuch LXX.Dan.1.8

Liddell-Scott-Jones

ἀρχιευνοῦχος (archieunouchos) chief eunuch G:N-M

ἀρχιευνοῦχος-ευνοῦχος, ,

chief of the eunuchs,[LXX+3rd c.AD+]

LSJ Scripture Refs: LXX.Dan.1.3