Did you link the wrong video? No name mentioned of Steve Dunham at 5:55 mark.....
From the article:
"As can be seen from Obamas own mouth, at about 5:55 into the above video, he clearly says that his name is Steve."
Although, I don't hear him say "Steve", either, around the 5:55 mark.
Found the video where he says his middle name is “Steve”...it is in Part 2 of the dinner video at about 1:36