What is the origin of the dance name "Foxtrot"?
it resembled a fox's attack because the tempo of steps based on syncopated counting slow-slow-fast-f
it was one of the smoothier dances and it resembled a sneaking fox 
it originates from the actor's Harry Fox last name
it introduced trotting steps
Harry Fox has indeed introduced trotting steps to this dance. Originally, the foxtrot was supposed to be a simple, smooth and relaxation giving dance. After years, it has become very technical, and today is called "the world's hardest stroll".
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it resembled a fox's attack because the tempo of steps based on syncopated counting slow-slow-fast-f
it was one of the smoothier dances and it resembled a sneaking fox 
it originates from the actor's Harry Fox last name
it introduced trotting steps
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