My guess is that it came from the time when the USA had control of Phils, as even now, all American males are circumcised at birth.
It is not a tradition in Spain even now, so we can rule them out.
I used to make fun of my American male friends when I lived there.
They don't even know why this is still the practice in their own country.
The origin of circumcision came from days long ago in the Middle East when it was considered to be more clean to chop the skin off to prevent the build up of bacteria when bathing was not something they used to do very often.