Old French cauquemare

← Old French cauche (mention)

← Old French chuacier (mention)

← Old French mar (mention)

← Latin calco (derived)

→ Belarusian кашмар (derived)

→ Bulgarian кошмар (derived)

→ French cauchemar (inherited)

→ Macedonian кошмар (derived)

→ Russian кошмар (derived)

→ Serbo-Croatian кошмар (derived)