Eivind Vågslid, Norderlendske fyrenamn, 1988, ISBN 82-991668-0-2
Roland Otterbjörk, Svenska förnamn, Stockholm 1964
Etymology
The first part is Old Norsegunnr(“battle”), from Proto-Germanic*gunþiz.
The second part is vǫr. Probably derived from the Old Norse adjective varr(“careful, wise, loyal”), cognate to the Gothic adjective 𐍅𐌰𐍂𐍃(wars, “cautious”). Alternatively, vǫr is cognate to Proto-Germanic*wari-(“warrior”).