Ὀρχομενός · Orchomenos — LSJ
the name of several Greek cities, the most famous of which was Ὀρχομενὸς Μινύειος in Boeotia, Il. 2.511, etc.:—
Adj. Ὀρχομένιος, Hp. Ulc. 7, Hdt. 9.16, SIG 519.7 (Aegium, iii B. C.), Str. 9.2.40 :—
side with the Orchomenians
hence Ὀρχομενίζω, side with the Orchomenians, Hellanic. 81 J. (but perh. not Hellanic.).—The old Boeot. form was Ἐρχ-, and this is found in Inscrr. and on coins to the time of Alexander, SIG 60 (v B. C.), IG 7.3166, al., BMus.Cat.Coins Central Greece p.54: the Arcadian Orchomenians are similarly Ἐρχομένιοι SIG 31.12 (Delph., v B. C.), Ἐρχομίνιοι IG 5(2).343 (Orchom. Arc., iv B. C.).