Was this arbitrarily established by someone? If so, by whom and when?
You don's know???
I know that not all names on Polish calendar are recorded after a martyr. Some names that you see on a Polish calendar are biblical, Slavic and historical, even diminutives of such - these names were noted in the Polish calendar to honor the persons good deed, an admirable act, a miracle blessing, etc.
For Example:
Grażyna, its a Polish diminutive of a biblical name in different language, which stands for 'God's miracles and blessings done to humans in the past and his promise to do so in the future to those who are worthy'.
:0)
My fascination within the history behind first names is quite Polish.
What's the story behind your name?