Sainz
A Spanish surname that began as a patronymic, meaning "descendant of Sancho."
The #8,511 most common surname in the United States (2010 Census) — about 1 in every 79,800 Americans shares it.
Etymology
Sainz is a patronymic surname formed from the old personal name Sancho. The ending -z in Spanish surnames generally signals descent or filiation, so the name originally meant "son of Sancho" or more loosely "of Sancho's family." The spelling reflects a northern Spanish form that became established as a hereditary surname.
History
The name is especially associated with northern Spain, where patronymic surnames like Sainz, Sáenz, and Sánchez developed early and remained common. It appears in medieval documents from the Iberian Peninsula and later spread more widely through Spain and the Spanish-speaking world. In some regions the spelling Sainz was preserved as a distinct family name alongside related forms such as Sáenz.
Origin
Regions
Variant spellings
Fun fact
Because Spanish patronymic surnames often fossilized into fixed family names, modern bearers of Sainz do not necessarily have a recent genealogical link to anyone named Sancho.
From the historical record
“^Bauchb, esseau, bois pour couvrir les maisons. L*eglise nostreDame et de tout Sainz, qui jadis fu apclëe PantheoUf fist couvrir de bawihe* Chron, de S. Denis, 1. Y, ch. stii.”
— Noms de famille normands