Need help with Coat of Arms surname translation

Hey, a friend has asked me to help make him a coat of arms for his family. His parents surnames are Wagner and Gunther. Rather than writing out Wagner and Gunther, I would like to use the etymological meaning of each surname.

From a little bit of searching, Gunther seems to derive from the 5th Century Burgundian King, in this case would it make sense to have the name Gundahari written in Elder Futhark: ᚷᚢᚾᛞᚨᚺᚨᚱᛁ?

And then since Wagner derives from wagon maker, would Waganari written as ᚹᚨᚷᚨᚾᚨᚱᛁ be correct?

Thanks for any assistance you can offer, I don't know much about these things so any help is much appreciated.