The surname Ettenhofer originates from Germany, with its roots likely traced back to the Middle Ages. It is a compound surname deriving from the elements "Etten" and "hofer." The suffix "hofer" is common in German surnames, typically indicating someone who owned or managed a farm or estate, stemming from the Middle High German word "hof," meaning "farm" or "courtyard." The prefix "Etten" may be linked to a geographic location, possibly a place name existing in medieval Germany.

One of the earliest historical references to the name Ettenhofer appears in regional documents from Bavaria, a region in southern Germany known for its varied terrain and historical states. The name was first recorded in the 14th century, often linked with individuals who owned land or were involved in agrarian activities. An old spelling variation, "Ettenhoffer," can be found in a manuscript dated 1389, further evidence of the name's medieval origins.

A distinguished person bearing the name Ettenhofer in the 16th century was Wilhelm Ettenhofer, born in 1542 and died in 1601, who was recognized as a merchant of some repute in Munich. He was known for his involvement in the local trade and commerce, contributing to the economic development of the city during the Renaissance period.

Another notable figure was Johann Ettenhofer, born in 1624 and died in 1683, a well-regarded craftsman in Nuremberg. His work in metal engraving earned him local fame, and several pieces of his artistry can still be found in museums dedicated to German metalwork and craftsmanship.

Maria Ettenhofer, living in the early 18th century, was a poet and writer from Augsburg. Born in 1708 and died in 1776, her collected works, although not as widely recognized as her contemporaries, provide valuable insights into the social life and cultural norms of the time.

One of the more influential personalities with the surname was Anton Ettenhofer, an academic born in 1785 and died in 1852, who made significant contributions to the field of botanical sciences. His works on plant morphology and classification were pivotal in the advancements of botanical studies during the 19th century in Germany.

The name also saw recognition through Therese Ettenhofer, a 19th-century social reformer born in 1834 and died in 1899. Her advocacy for educational reforms, particularly in rural Bavaria, paved the way for modern schooling systems that were more inclusive and accessible to children from all backgrounds.

Throughout its history, the surname Ettenhofer has been associated with a blend of agricultural, artisanal, and intellectual heritage, reflecting the multifaceted contributions of its bearers to German society across centuries. The geographic and occupational components of the name emphasize its deep connection to the land and the societal structures of medieval and early modern Germany.