Χριστιανός (D, Χρεισ-; on the form Χρησ-, see Bl., § 3, 6; 27, 4 on the ending, -ανος, see Bl., ll. with; Deiss., LAE, 382), -οῦ ὁ, a Christian, the name first given to the disciples by pagan gentiles at Antioch: Refs Act.11:26 26:28, 1Pe.4:16 (see reff. in Thayer, see word; also DB, i, 384).† (AS)
Thayer:
1) Christian, a follower of Christ
Χριστιανός
Christianos
khris-tee-an-os'
From G5547; a Christian, that is, follower of Christ