I have a rare name (only nine in the US), but in this country, one of the people with the same name is my son, who has a web presence in his real name concerned with some very serious topics.
I would not want people to associate my random interjections with those of my son David.
Darowyn is the name I use on stage, so it is the obvious choice on here.
But I do sign off with my real name,(like this)
I don't always remember to sign in when I post from work, though.

Cheers
Dave