The German word for king is König, plural Könige
blues boy
There is no new German empire.
Herald
Sergei (note spelling) is a Russian given name.
German Empire is the name often given in English to Germany from 1871-1918.
yids/kikes
Hessian's
The German mercenaries that fought for Britain in the Revolutionary War were called Hessians deriving their name from the German state they were from, The Duchy of Hesse.
German Democratic Republic (GDR) In German: Deutsche Demokratische Republik (DDR)
This is not a German phrase. If it is a given name, Anna is the same as Anna in English. Renko is a family name with Scandinavian roots.
None of the characters in this story were given names by the author.
You just said it, "Submariners" or simply "crewmen."