Lets see ...
Your not really attacking anyone ship to ship so the classic Pirate thing is in question.
You don't rob from the rich and give to the poor so the Robin Hood thing is out.
Do they even have snuff in this game? The Swashbuckler reference is out 
Errol Flynn had stealth? Backstab?
Rogue would be the proper name I would think and that would cover everything. I guess they ran out of sub-class names and had to go with what they had. The truth may be that the char class was just poory named for what it does and its up to the user to live with it or not.