If you are asking about this website, then yes you can. Your username can be anything that you'd like.
can use a name like Daniel 2:44 to answer questions instead of my real name?
See the first paragraph in "Terms of use". You MUST be prepared to use your real name. However, I think I am the only contributor that does.
It brings up an interesting philosophical question I sometimes ponder: Who does your name belong to?
If my name belongs to me, I can change it anytime I want - without asking any body's permission.
If "my" name doesn't belong to me, I have to ask permission to change it.
Is this in reference to this verse:
"In the days of those kings the God of heaven will set up a kingdom which will never be destroyed, and that kingdom will not be left for another people; it will crush and put an end to all these kingdoms, but it will itself endure forever."
Why not seek a name that doesn't carry such message of "Magic and myth" . . . You could be known as "Gandalf the Grey" . . .