Bauchnabel (German) comes from German Bauch, from Middle High German būch, from Old High German būh, from Proto-West Germanic *būk, from Proto-Germanic būkaz, from Proto-Indo-European bʰōw- — to inflate, swell; to swell, grow, thrive, be,...
Bauchnabel (German): navel, bellybutton, umbilicus
Bauchnabel traces back through two separate lines of ancestry.