The origin of the word "Casorate" is debated. A
Latin etymology for the word has been considered, especially from the word
casula (little house), or the
medieval Latin term
casuri (also little house). On the other hand, a
Celtic origin of the name has been suggested to, from the word
casurus, which would date back to the
Gaulish domination, which might suggest that the town's origins are even older than the generally accepted theory of a
Roman origin. In 865 AD, a document makes reference to
Catoriacum or
Catoriaco, which is believed to be a reference to Casorate. In 1193, it seemed to be called
Caxeradho. The addition of "Primo" (Italian for "first") to Casorate came about on March 15, 1863, due to it belonging to what was at the time the First District of Milan, and it has since then been named thus. == History ==