An Etymological Dictionary of the German Language/Annotated/Ziegel
Ziegel, masculine, ‘brick, tile,’ from the equivalent Middle High German ziegel, Old High German ziagal, masculine. The word was borrowed in the pre-High German period, perhaps contemporaneously with Mauer, Pfosten, Spiegel, and Speicher, from Latin têgula, whence also the Romance cognates, Italian tegghia, tegola, French tuile; from the same source are derived Dutch tegehel, tegel, Anglo-Saxon tigel, English tile. Tiegel is not a cognate, but a genuine Teutonic word, although Latin tegula and its Romance forms may be used in the sense of Tiegel.