My son's last name is showing incorrect on my forms I efiled, how do I change this?

[DDollar]

It should not make any difference as long as you got his social security number correct.  There is a possibility it could be rejected by the IRS (if not already accepted).  If so, you can go back into your return and correct it, but once it's been e-filed you cannot make any changes to your return - unless it is rejected.