Dunkelsonn is the last name I've come to use in most games that support last names.
The story behind it is usually a justification for the jaded lone wolf nature of my characters.

Born during a solar eclipse, a dark sun, they immediately fell upon hard times. Their mother died during childbirth and the rest of their village took it and the eclipse as a bad omen.
Anything bad that happened was blamed on them and nobody dared associate with them more than necessary for fear of misfortune to befall them.
They've left their village as soon as they were able to fend for themselves and don't put a lot of stock into other people.

As for the first name, Karma is not one of my usual names. After using a Fantasia and changing not only my race but also my gender I've decided to find a somewhat gender neutral name so I don't have to rename my character if I decide to switch again.
After giving it some thought I've decided on Karma because it fits nicely into my character's outlook. They believe that everything happens for a reason and they deserve the misfortune that seems to follow their every step. Saving the world ought to offset some of that.