rogue: [16] Rogue originated as a thieves’ slang term for a ‘vagrant’ in the mid-16th century. It is not clear where it came from, but one suggestion is that it was derived from the contemporary slang term roger ‘beggar who pretended to be a poor university student in order play on people’s feelings’. This was based on Latin rogāre ‘ask’, source of English interrogate, prerogative, etc. [rogue etymology, rogue origin, 英语词源]