I’m watching Marathon Man again on AMC and need a long-awaited answer.
The National Socialist Deutche Arbeiten Partei (please correct the mangled spelling, it’s been a few years since I’ve studied German) comes out to NSDAP. In English it’s the National German Worker’s Party, or NGWP. So where does NAZI come from?
The best I can think is it’s an anglicized phonetic reading of NSDAP in some convoluted way. Though even that doesn’t make much sense.
‘Gestapo’ for Geheime Staatspolizei (Secret State Police) is another common abbreviation of this type from the Nazi era. In the post-war era, the East German secret police were called ‘Stasi’ from Ministerium für Staatsicherheit (State Security Ministry).
This type of abbrevation isn’t restricted to political names though – there’s ‘KaDeWe’, ‘Kaufhaus des Westens’ (Department Store of the West), a large department store in Berlin.
And not all political organizations were abbreviated like this, such as the SS and the SA. Those would’ve been something like ‘Schuta’ and ‘Stuab’, which makes it clear why they weren’t. I think the abbreviations taken from the first syllables of words are generally meant to be familiar and colloquial. For this reason, political speakers would talk about the ‘NSDAP’ and less often about being ‘Nazis’. I don’t recall ever seeing the Gestapo referred to as anything else in English though.