what his name vs what's his name

Some examples from the web:

• I just want to know what his name is.
• If anyone knows what his name is I could check that way.
• We don't know what his name is yet... but he's definitely working for Patrovita.
• He seemed nervous, so I ask him first what his name was before telling him your daughter was missing.
• IRVING: How am I supposed to know what his name is?
• Just tell me what his name is.
• I even knew what his name would be.
• Somebody asked Brando what his name is.
• I'll let you go ahead and guess what his name is.
• I have no idea what his name is.
• I don't know what his name is.
• DJ: It was amazing, because you can see that this lion is doing exactly what his name, Eetwidomayloh, represents.
• I need you to get his wallet and tell me what his name is, Casey.
• I need to know what he looked like and what his name was.
• I've been trying to remember what his name is.
• You don't even know what his name is. Walk faster.
• There will be a moment when you will just know what his name should be.
• I will ask that homeless man what his name is and how his day was, because sometimes all people want to be is human.
• Who cares what his name was?
• It doesn't matter what his name was...

Some examples from the web:

• Tell him to call what's his name...
• Which we will then bring back to what's his name's.
• The man, what's his name?
• Watching your archer, what's his name?
• All right, what's his name?
• This fellow, what's his name?
• So this teacher, what's his name?
• The Acura dealer, what's his name, he took 20 units.
• O... what's his name there, the new one.
• Incidentally, what's his name?
• There's a chap in America, what's his name, Charles Ponzi, who offers a huge return after 90 days.
• Juanita, what's his name?
• Maybe his friend, what's his name? - Travis.
• Like that director, what's his name?
• You go to what's his name's to help him with his...
• This regular, what's his name?
• That tall guy, what's his name?
• Such a cutie. what's his name?
• And your little partner there, what's his name?
• Your chap in pathology, what's his name, Sinclair?