Perhaps you mean Gustav Klimt.
Based on the last name, I'd say Russia. Though, Gustav is a German name.
Holst Two come to mind, Gustav Mahler, Austrian, 1860-1911 and Gustav Holst,English "yes!" 1874-1934.
I would suggest the middle name "Hans" for Gustav. It has a strong, classic sound that complements the traditional feel of Gustav.
Gustav
Gustave is/was a very large Nile Crocodile living in Burundi, estimated to be over 20ft and responsible for the deaths of over 300 people. He has earned himself the reputation as a notorious maneater.
J.M.W. Turner's first name is Joseph.
Dali.
Peter
Édouard
Google last name!
Gustav Gavrin's birth name is Gustav Schwarz.
There are two Holst or Malher.