Sedillo
A Spanish-language surname likely formed as a diminutive or locative-style name, most strongly associated with the U.S. Southwest and New Mexico.
The #8,844 most common surname in the United States (2010 Census) — about 1 in every 83,355 Americans shares it.
Etymology
Sedillo is a Spanish surname, but its exact origin is not securely established from the available evidence. It is probably connected to a Hispanic naming pattern that uses the suffix -illo as a diminutive or affectionate form, possibly built from an older place name, nickname, or family name. Because no direct dictionary entry was available here, the safest reading is that the surname is Spanish in form and likely regional in origin, rather than confidently tied to a single root word.
History
The surname is found especially in the American Southwest, particularly among families with deep New Mexican and northern Mexican roots. Like many Hispanic surnames in the region, it likely spread through colonial-era settlement and later migration rather than through a single well-documented origin point. Modern bearers of the name are concentrated in the United States, where it remains relatively uncommon but regionally recognizable.
Origin
Regions
Variant spellings
Fun fact
In U.S. records, Sedillo is much rarer than the closely related-looking surname Cedillo, which sometimes appears in the same broad Hispanic naming context.