A kobold is a generic name for a household spirit in German folklore.
The kobold of Hildesheim―Illustrated by William A. McCullough, Nymphs, Nixies and Naiads (1895)
Household spirit, kobold, or gütgen―engraving by Thomas Cross, Sr. (fl. 1632-1682), frontispiece to Praetorius (1668) [1666] Anthropodemus Plutonicus.
Plant-people, Alraun (mandrake) ―engraving by Thomas Cross, Sr. (fl. 1632-1682), frontispiece to Praetorius (1668) [1666] Anthropodemus Plutonicus.
Hinzelmann was a kobold who haunted Hudemühlen Castle.―Willy Pogány illustr. (1912), "The Little White Feather" in The Fairies and the Christmas Child ed. Gask
A gnome is a mythological creature and diminutive spirit in Renaissance magic and alchemy, introduced by Paracelsus in the 16th century and widely adopted by authors, including those of modern fantasy
Demons in the mine. Olaus Magnus, Historia de gentibus septentrionalibus
Bergmännerlein, Wights, and Subterraneans (Unter-Irrdische). Engraving by Thomas Cross, Sr. (fl. 1632–1682), frontispiece to Praetorius (1668) [1666] Anthropodemus Plutonicus.
Silver Thaler coin. Goslar mint. Dated 1587