[ephaeton]

Locals don't speak a phonetically hard 'k' in the middle when refering to that village. If you heard them say the name, you'd not be sure whether to write it with gg or ck in the middle. (NB: I live in a village essentially next to Fucking)

[wirrbel]

This. I live in southern Germany (swabia) and many village names kind of have a 'standard german' spelling and a local pronunciation. I feel like Fugging might just be a change that reflects a more austrian pronunciation in the spelling.