Why couldn't you just use first names or maybe add some fun and let the
kids make up their own names that are like nick names. Dan the Man, Mad
Mike, Like they make up names for sports people.
They could still know who each other is and enjoy that but not have the
worry of strangers. But no way would I put anyone's real name on the
net. Not after my friends daughter was called by a man after her name
was on TV.