Dux is used in other contexts, eg in Portugal for leaders of universities 'fraternities'. No fascist implications whatsoever.
Some people are eager to raise their pitchforks, but we don't need to police every word.
This is because you are not Italian. If in Italy you find a wall writing with Dux on it, there is 100% only one thing it can mean. To me this sounds as weird as someone naming their project Führer