Surnames, can you change them?

[Vormotus]

Hi guys, one very simple newbie question.

Can you, once achieving level 20 get a surname option and can this surname be changed every few weeks?

Or is it permanent? Just wondering if I should add one and later change it if the mood strikes me? [You must be logged in to view images. Log in or Register.]

Many hugs and cheers from the Isthmus!