Cadence is a word - it means a pattern of sounds (basically).
People are now using it as a name - okay.
The correct spelling is going to be how the word is spelled. The others? Parents' ideas of "improvement."
exactly, it's what soldiers march to... A lot of Cadences are very crude and I would never name a child that.
Example of a Cadence..
I wish that all the ladies, were pies on the shelf.
And I was the baker
I'd eat em all myself
I wish that all the ladies, were holes in the road
And I was the dumptruck
I'd fill em with my load
I wish that all the ladies, were bats in a steeple
And I was the kingbat
There'd be more bats than people