That's the name of the company according to both Wikipedia and an Internet search.
Yes, but Ges.m.b.H. just denotes the type of business entity. Once you take that away, all that's left is what we already have. Unless you're also suggesting we change H&K to "Heckler & Koch GmbH" or Beretta to "Fabbrica D' Armi Pietro Beretta S.p.A.", why do it for Glock?