Adelung-1793: Krug, der
Brockhaus-1837: Krug
Brockhaus-1911: Krug von Nidda · Krug · Leibl
Eisler-1912: Krug, Wilhelm Traugott
Herder-1854: Krug
Meyers-1905: Krug [3] · Krug [2] · Krug [1] · Leibl
Pataky-1898: Krug, Frau Maria · Krug, Charlotte · Krug, Anna
Pierer-1857: Krug [2] · Krug [1]