Walther, Rohm, J. P. Sauer and Sohn, Blaser, Max Ern, F. Henninghaus, HEYM AG are a few.
IA is a two digit date code, not a maker
Right off hand, I can think of a couple: Sig Sauer, Walther, H&K
It is unlikely. The suffix -stein in last names generally indicates Jewish descent.
German for German Shepherd is 'Deutsch Schäferhund." It's also known as the Alsatian.
This name originates from the Dutch and German (northwest). Derived from the name of a father or ancestor with the personal name Hendrik (Henry). The family names Hendryk, Hendryck, Hendricks and...