Champagne Krug takes on Austrian producer over Krug name
"Isn't" doesn't mean "didn't." Joseph Krug founded the Champagne house in 1843; Charles Krug founded his winery in 1861. I wonder if, being from Mainz originally, Joseph was concerned about taking on the Prussian Charles.
More likely, however, is that Charles Krug came first in terms of getting their product to American consumers . . .
Then again., Krug has operated continuously since 1843, whereas Charles Krug all but ceased operations with Prohibition, and was reopened in 1941 when purchased by Cesare Mondavi. Champagne Krug, being in France, may not have noticed right away . . . something to do with the war, I'm sure.