Where does “sędzia” come from?

sędzia (Polish) comes from Proto-Slavic sǫdì, from Proto-Indo-European som-dʰh₁-ih₁.

sędzia (Polish): judge, justice; referee

Definitions

Step	Language	Word	Meaning
1	Proto-Slavic	sǫdì	judge
2	Proto-Indo-European	som-dʰh₁-ih₁	—

sędzia — Etymology, Origin & Word History | Etymology Explorer