I'm German-American thus am quite familiar with Günther and Günter, yet I didn't realize this was a related name until I looked it up just now. I've only met Gunners/Gunnars in the U.S. and just thought it was some sort of tough-guy name given by lower-class white people who dress their children in camouflage when the family doesn't have any actual military connection; it seems to fit with the children I've met who have this name.
-- Anonymous User 10/9/2011
Gunnar is my brother's name. Other than a few young boys that couldn't be bothered to listen to how people say it, he's never been called 'Gunter' or 'Gunther'. He is never thought of as a violent person, even though 'gun' is in his name.