About the surname
Casillas maintains a steady and notable presence within the American population. The latest demographic counts confirm that 21,643 Americans have this surname. While not overwhelming, this solid count ensures the name is well-represented in regional demographic data. To put its frequency into perspective, roughly 1 in every 15,386 individuals in the US bears this last name. There is virtually no ethnic parity here; the Hispanic or Latino demographic completely overshadows the White group by a massive 88% margin.