Why is boxing day so called?

Answer 1

In many countries December 26th is known as St Stephen's Day - because it is the church feastday that falls on that day.

The Christian Church had a feast-day for every dayof the year.... and sometimes several fell on the same day.

Answer 2

It is believed that the Boxing Day started in England, in the middle of the nineteenth century, under Queen Victoria. This was a way for the upper class to give gifts in any form to the lower class people. On this day the Priests used to open the church's charity boxes and distribute them among the poor.