I think if you name your child Karsyn I will personally drive to your house just to punch you in the face.
I believe people can use it any way, But to me I believe its a boy name...Just my opinion...
I think most all names can be used for both sexes. I would keep the C and spelling for either gender though.
I think both spellings are boy names.
It's a boys name, some people like to be "unique" and give a girl a boys name.
I don't like Karsyn. It sounds like a boy's name with a girly spelling to be honest.