Need help naming a character?

So my character is tough. He's an assassin and very quiet and mysterious, but he follows orders well and is very loyal to his cause.

He's tall, in the 6-foot range and always has a scowl on his face but cracks an occasional smile.

He's very serious. But he's good at what he does.

He's in his late twenties. I want to say 28. He has a muscular build and has brown hair, dark eyes and scruff on his face. He's attractive, but too intimidating to approach.

He has confidence, he's just quiet. He stands at the back of the room with his arms folded, but stands tall. But he can be a leader if there's no one else. He prefers to work alone though.

He speaks his mind and tells the truth.

So I need a good name for him.

Last names would be appriciated as well.

Thanks for the help!