Ok, so i found out that for the German Navy (doesn't know for other nations, i will check it out) the names used for the different ships are the names of individual ships, not their respective class. For exemple: the S-110A and S-120 Type 214 subs buildable by Germany, are in fact both individual ships (Submarines) serving in the Greek Navy. They are actually one Type 209, or U-209, and one Type 214 submarine build for export by Germany. This is also the case for a few others. Also, the names of a few other ships class are a bit confusing, either refering to individual ships, or having typing mistakes.