A.T. Robertson Commentary James 2:7

"Do not they blaspheme the honorable name by which ye are called?" — James 2:7 (ASV)

Blaspheme (βλασφημουσιν). Present active indicative of common verb βλασφημεω (from βλασφημος, speaking evil, βλαξ or βλαπτω and φημη), as in Lu 22:65.

The honourable name (το καλον ονομα). "The beautiful name."

By the which ye were called (το επικληθεν εφ' υμας). "The one called upon you" (first aorist passive articular participle of επικαλεω, to put a name upon, to give a surname to, as Ac 10:18). What name is that? Almost certainly the name of Christ as we see it in Ac 11:26; 26:28; 1 Peter 4:14,16. It was blasphemy to speak against Christ as some Jews and Gentiles were doing (Acts 13:45; Acts 18:6; Acts 26:11; 1 Corinthians 12:3; 1 Timothy 1:13). Cf. Acts 15:17.