Hi Juha,
A little off topic! But I found this:
Lokki
Found in Old Danish as Lokki and in Old Swedish as the by-name Lokke. Derived from OW.Norse lokkr "curl, lock of hair." Runic examples include the nominative forms lki, [luki].
NR s.n. Lokki
On this website. It does not sound as good as your definition of Gull, and yours sounds more like the true meaning of a Mountain .
http://www.vikinganswerlady.com/ONMensNames.htm
Regards,
Dave.