http://codexsinaiticus.org/en/search.aspx?dd_books=&searchTarget=transl&searchquery=christian&x=0&y=0
1 Peter, Chapter 4, Verse 16
but if he suffer as a Christian , let him not *be ashamed, but let him glorify God in
Acts, Chapter 26, Verse 28
little labor thou persuadest me so as to make me a Christian .
Acts, Chapter 11, Verse 26
multitude; also, that the disciples were called Christian s first in Antioch.
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Go check the actual Greek and notice the translators have corrected chrEstian to chrIstian in each scripture.
http://en.wikipedia.org/wiki/Tacitus_on_Christ#Christians_and_Chrestians
Van Voorst has stated that it was unlikely for Tacitus himself to refer to Christians as Chrestianos i.e. "useful ones" given that he also referred to them as "hated for their shameful acts". [17]
BTW the rest of paragraph is an interesting read, but its particularly interesting that the original word didnt mean follower of christ but "Useful ones".