Where does “Fiszer” come from?

Fiszer (Polish) comes from German Fischer, from Middle High German vischære, from Old High German fiscari, from Proto-Germanic fiskārijaz, from Proto-Germanic fiskaz, from Indo-European *peysk-.

Ancestry of “Fiszer”, step by step

Step	Language	Word	Meaning
1	German	Fischer	fisher, fisherman
2	Middle High German	vischære	fisher, fisherman
3	Old High German	fiscari	—
4	Proto-Germanic	fiskārijaz	fisher
5	Proto-Germanic	fiskaz	fish
6	Indo-European	*peysk-	—

Every word from Indo-European *peysk- →Every word from Proto-Germanic fiskaz →Every word from Proto-Germanic fiskārijaz →