Mertz
A German surname that likely began as a short form of a personal name related to Marz/Mark and was later fixed in family use.
The #4,521 most common surname in the United States (2010 Census) — about 1 in every 39,376 Americans shares it.
Etymology
Mertz is generally treated as a German surname formed from a shortened personal name rather than from an occupation or place. The historical material you provided links it with German name forms such as Marz and related diminutives, which suggests an origin in a pet form or nickname based on an older given name. In practice, surnames of this type often developed from a father's given name and then became hereditary family names.
History
The name is found in German-speaking areas and later appears in immigrant records in the United States. The excerpted historical source also notes that German names like Mertz were sometimes altered in spelling by English-speaking officials, which helps explain later variants in records. In America, the surname became established in communities with German ancestry.
Origin
Regions
Variant spellings
Fun fact
19th- and early-20th-century records show that Mertz was sometimes miswritten or reshaped in immigration and naturalization paperwork, creating extra spelling variation.
From the historical record
“MAN, man ; sing. st. ab., Mann ; dim. (k + 1), Mengel. MAR, famous; dim. (z), Mertz. MARK, frontier; Marquardt (Mark + ward); dim. (1), Merkel, Markli (Swiss). MAUR, a Moor ; sing. st. ab., Mohr.”
— Studies in Pennsylvania German Family Names