Casias
A Spanish-language surname most likely tied to place names or a regional form related to houses or homesteads.
The #9,800 most common surname in the United States (2010 Census) — about 1 in every 93,474 Americans shares it.
Etymology
Casias is best understood as a Spanish surname, most likely formed from a place name or local topographic term. It may be related to Spanish casa, meaning "house," pointing to someone who lived by or came from a particular house, settlement, or named place. In some cases, surnames of this type reflect regional spelling or pronunciation rather than a single fixed root.
History
The surname is found mainly in Spanish-speaking and Hispanic-American contexts, especially in the Americas. Its present spelling may reflect regional variation or the adaptation of an older Spanish name in records that were inconsistent about accents and vowel endings. Because Casias is less common than major Iberian surname types, its precise origin can be hard to pin down to one locality without family-specific research.
Origin
Regions
Variant spellings
Fun fact
Surnames built from casa- forms are common across the Spanish-speaking world because houses, hamlets, and named homesteads often became identifying place-based surnames.