Where does “Sparfüchsin” come from?

Sparfüchsin (German) comes from German Sparfuchs, from German Fuchs, from German Feist, from Middle High German veizet, from Old High German feizzit, from Proto-West Germanic faitid, from Proto-West Germanic fait, from Proto-Germanic faitaz — fat, milk.

Ancestry of “Sparfüchsin”, step by step

StepLanguageWordMeaning
1GermanSparfuchsa person who looks for bargains; a scrimper
2GermanFuchsfox; a clever or cunning person; a red-haired...
3GermanFeistfart
4Middle High Germanveizet—
5Old High Germanfeizzit—
6Proto-West Germanicfaitidfattened, made fat
7Proto-West Germanicfaitfat
8Proto-Germanicfaitazfat
9Proto-Indo-EuropeanpoyH-—
10Proto-Indo-EuropeanpeyH-fat, milk
Every word from Proto-Indo-European peyH- →Every word from Proto-Indo-European poyH- →Every word from Proto-Germanic faitaz →