Yes, but in a way only:
The Schüler or Schueler (German Umlaut, not "Schuler")Company was founded by August Schüler in 1835. From 1913 on grandson Richard Schüler was the owner. Address Roschstr. 13, Suhl.
The 6.5x68 and 8x68 cartridges are often erroneously labeled "Schüler" in America, but were not Schüler cartridges. They were developed by RWS, the ammo company, the 8x68 in 1939, the 6.5x68 in 1940.
The Schülers, sons Friedrich and Oskar, grandson Richard, developed several other cartridges:
11.2x60 aka .440 Schüler, about 1905
11.2x72 aka .444 Schüler aka 11.2 mm Krieghoff, about 1907
11.2x72R, rimmed version of above
12.7x70 Schüler aka .500 Jeffery, about 1926
.404 Schüler Magnum, a very obscure number slightly larger than a .416 Rigby, about 1939. Only one rifle known. In the 1990s Suhl gunmaker Ziegenhahn tried to revive this .404 Magnum, but without success.