German dass

← German das (mention)

← English that (cognate)

← Proto-Germanic *þat (derived)

← Old High German daz (derived)

← Dutch dat (cognate)

→ English that (cognate)

→ Cimbrian dat (mention)

→ Danish at (cognate)

→ Luxembourgish datt (cognate)

→ Volapük das (borrowed)