I believe more details of your grandfather would be helpful.
What was his date of death? When & where was he born? Where did he live?
Social Security death records show (1) George W. Nace, born 2 Jun 1920 died 28 Mar 2008 Richfield, Juniata, Pennsylvania
and (2) George W. Nace born 18 Feb 1947 died 29 Jul 2010 Highland, Ulster, New York.
In my Nase Family tree, I do not yet have your grandfather but I'm pretty sure we could find some connection.
Almost all of the various spellings of Nace descend from from Mathias Nehs (1673-1741) who immigrated to Philadelphia in 1731.