Abbott-Smith Manual Greek Lexicon
Βελιάρ (G955)
1 Βελιάρ , ὁ , indecl. (another form of previous word, "due to harsh Syriac pronunciation," or else בֵּל יַעַר , lord of the forest ), Beliar , a name of Satan: II Co 6:15 (v. DB , i, 269).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain