Jamieson, Fausset and Brown on James 2:7

7. "Is it not they that blaspheme?" &c. as in Jas 2:6 [Alford]. Rich heathen must here chiefly be meant; for none others would directly blaspheme the name of Christ. Only indirectly rich Christians can be meant, who, by their inconsistency, caused His name to be blasphemed; so Eze 36:21, 22; Ro 2:24. Besides, there were few rich Jewish Christians at Jerusalem (Ro 15:26). They who dishonor God's name by wilful and habitual sin, "take (or bear) the Lord's name in vain" (compare Pr 30:9, with Ex 20:7).

that worthy name--which is "good before the Lord's saints" (Psa 52:9; 54:6); which ye pray may be "hallowed" (Mt 6:9), and "by which ye are called," literally, "which was invoked" or, "called upon by you" (compare Ge 48:16; Is 4:1, Margin; Ac 15:17), so that at your baptism "into the name" (so the Greek, Mt 28:19) of Christ, ye became Christ's people (1Co 3:23).