Hitler would have been greatly offended if you called him a Nazi. Though embraced by extreme alt-righters today, the fascists of WWII Germany generally avoided the term, which was a colloquialism for "dunce" in southern Germany before the war. The word got applied to them when fleeing anti-fascist Germans cleverly abbreviated Nationalsozialist, an already shortened version of the party name. This spread to the countries they migrated to as a general term to encompass Hitler's group (who would've preferred NSDAP). The pejorative colloquialism Nazi was a nickname for Ignatz, a common name much like "John", with a country-bumpkin connotation of stupidity and ignorance. This in turn likely derives from Latin Ignatius, a Biblical name with possible origins in Ancient Greek, or Latin, or something. Honestly, etymologists aren't completely sure. But we are positive about the whole Nazi-insult thing. Believe me.
Adam Aleksic, a leading contender for valedictorian of his high school, is a 210-month-old boy with disturbing interests in etymology, vexillology, geography, and law. Adam would like to one day visit Tajikistan and probably isn't spying for the Kyrgyz government.
The Etymology Nerd