Polish co

← Proto-Indo-European *kʷid (inherited)

← Proto-Indo-European *kʷis (mention)

← Proto-Slavic *čьto (inherited)

→ Belarusian што (cognate)

→ Polish coś (affix)

→ Polish cokolwiek (suffix)

→ Polish cóż (suffix)

→ Polish ladaco (compound)

→ Rusyn што (cognate)