Proper noun
Costilla (plural Costillas)
A surname.
Eventually these early movements were crushed by the royalist troops by 1810, including those of Miguel Hidalgo y Costilla in Mexico in the year 1810. Source: Internet
Much of the land in the south part of the Valley, in Conejos and Costilla counties, was originally part of large Mexican land grants and is private land. Source: Internet