Hartz
A surname most likely from a German form of Hart or Hertz, ultimately tied to the old Germanic root for “hard” or “strong.”
The #7,966 most common surname in the United States (2010 Census) — about 1 in every 74,343 Americans shares it.
Etymology
The surname Hartz is usually treated as a German surname built from the old Germanic element hart, meaning “hard,” “strong,” or “brave.” In some sources it is connected with shorter forms such as Hart or with names like Hertz/Hertz, rather than being a surname with a single fixed literal meaning of its own. The final -z likely reflects regional spelling and pronunciation development in German naming.
History
19th-century surname dictionaries often list Hartz alongside Hart, Hertz, and related forms, suggesting it developed as a variant spelling in German-speaking areas. The name appears in German and German-American records, and it was carried into the United States through immigration, where the spelling Hartz became established. Because the form is short and variable, some older authors treated it as a reduced or altered form of a fuller German name.
Origin
Regions
Variant spellings
Fun fact
Older surname handbooks sometimes grouped Hartz with a whole family of hard-/hart- names, showing how fluid spelling was before modern standardization.
From the historical record
“Erdel — Ertle. Patr. A. Hertling. (k): Hartig; Hartke; Hartje (ost- f ries.) —Harke — Hertig. (z) : Hartz. Auslautend (überaus häufig, 295 mal Forst, wodurch der Übergang in eine bedeu- tungslose Endung vorbereitet wird). 'hard: Eberhard. Einhardt. Gen. 'hartSf 'harx: Reinharx. Burg-”
— Die deutschen Familiennamen