from proto-indo-european dictionary
*sueb(h)o, *sued | own => free, own, independent
hence Swede and Suebi
*suerb | turn
*uend | turn
hence Serbs and Wends
note that Sorbs (small Slavic nation from East Germany) are also called Wends and Lusatians. they call themselves Serbja
also
*uend...