Naïvely one may have expected that Christian Walck would be a unique name. At least I did that for a long time! However, starting with the surname one finds while searching the net that even if it is unique for me and my close relatives within Sweden it is internationally not too uncommon. Not too surprising perhaps using only five letters... However, our name was taken in 1929 and there is no relation to those other Walcks.
Several people e.g. in the US have Walck as surname and we find that WALCK - Walck is the 16,291st most popular last name (surname) in the United States; frequency is 0.001%; percentile is 76.088 [SourceCBN]. At the same site we also find that there exist a place in Pennsylvania called Walcksville at the position 40°52'9" N and 75°39'22" W.
In the same region it still exists a community (commune) called La Walck (Walk in German) in province Alsace-Lorraine (Elsass-Lothringen in German), département Bas-Rhin, arrondissement Haguenau, canton Niederbronn-les-Bains, which had a population of 965 people in 1990. If you wish to find out where this place is you may look at zoomable maps made in connection with web-pages with recollections from WWII.
The web-pages on this second Christian Walck are made by a descendant (Carol Currie Eddleman) to Christian's brother Michael who unlike his siblings and parents seems to have used Wallick as his surname instead of Walck. This spelling of the family name is sometimes also used for Bernard Walck, the father of the first Christian Walck above.
Christian Walck, Walck@fysik.su.se, 15th of January 2003