Where does “Perz” come from?

Perz (Polish) comes from Old Polish pyrz, from Proto-Slavic pyrь, from Proto-Indo-European péh₂wr̥ — bonfire; spelt.

Ancestry of “Perz”, step by step

Step	Language	Word	Meaning
1	Old Polish	pyrz	—
2	Proto-Slavic	pyrь	remains of fire, smoldering ash, cinder; wild...
3	Proto-Indo-European	péh₂wr̥	bonfire; spelt

Perz — Etymology, Origin & Word History | Etymology Explorer