Fun Fact: A German Augmented 6th chord sounds the same as a Dominant 7th chord, just spelled differently.
Doubly Fun Fact: A German Augmented 6th chord and an English Augmented 6th chord are the same chords, with different spellings. A German Augmented 6th is used in the minor key, while an English Augmented 6th chord with a #2 instead of a b3 is used in a major key. This is because a b3 is already involved in the minor key, so no extra accidentals for that note are needed, and you can avoid parallel 5th's in the major key if you use an English Augmented 6th spelling as opposed to the German spelling.
Triply Fun Fact: The Augmented 6th chord's names don't have any true origin. It's like the naming of a French Horn as opposed to just Horn; they're mapped to specific regions that don't necessarily correspond with the use of the chord itself. This is true for the myriad of chords named after nationalities; English, French, German, Italian, Australian, the works.