San Carlos is a name of a saint which also and other place around the world. Philippines being one of Spaniards colonies before, has many places named "Sac Carlos'.
BRAZIL: http://en.wikipedia.org/wiki/S%C3%A3o_Carlos
PHILIPPINES: http://en.wikipedia.org/wiki/San_Carlos_City,_Negros_Occidental
PHILIPPINES: http://en.wikipedia.org/wiki/San_Carlos_City,_Pangasinan
CALIFORNIA USA: http://en.wikipedia.org/wiki/San_Carlos,_California
URUGUAY: http://en.wikipedia.org/wiki/San_Carlos,_Uruguay