I chose my name because "Epic" was my former schoolmates nicknames. Everyone named themselves "Epic".
I decided to be unique and put "epicly" instead behind my name, Isaac.
I always considered changing my name but in the end it just ends up with different Variations of EpiclyIsaac.
Former names:
EpiclyIsaac(When I started)
A51-EpiclyIsaac-(in A51)
_EpiclyIsaac(Booted from A51)
-Hearts-EpiclyIsaac(In the awesome club, Ace of Hearts)