renegade
‘one who rejects a religion, a cause, an allegiance, or a group for another; a deserter’
Lexical development traced from the Tamil root:
E. renegad < Span. renegado ‘a Christian turned Muslim’ < Med.Lat. renegatus < renegare ‘deny’ < Lat. re- + negare ‘to refuse’ < nuh < ne- < Tamil al