Proto-Slavic *či

→ Belarusian ці (inherited)

→ Czech či (derived)

→ Polish czy (mention)

→ Polabian cĕ (inherited)

→ Serbo-Croatian če (derived)

→ Serbo-Croatian či (derived)

→ Slovak či (derived)

→ Slovene če (derived)

→ Ukrainian чи (inherited)