Do you know who are they? vs Do you know they are?

Some examples from the web:

• D-do you know who they are?
• Drew, don't you know who they are?
• They don't know who you are, do they?
• - What do you know? - I know everything, dear Bartolo.
• - Do you know who this is? - How would I know?
• Do you know who took Gen?
• Do you know who shot Norrell?
• Do you know who killed Lars?
• Do you know who killed Michael?
• Do you know who I am? Yes.
• Wait. Do you know who?
• Do you know? I start to like this smell.
• - What do you know? - Man of your word.
• - How do you know? - I looked it up online.
• What do you know? Imagination.
• - How do you know? - I see him in all the clubs.
• What do you know? I know about tail spins.
• - How do you know? - I know things about people.
• How do you know who Jeanette knows, Ryan?
• Well, do you know who did?

Some examples from the web:

• What do you do when you know they are?
• What do you do when you know they are?
• - Then how do you know they aren't?
• D-do you know who they are?
• Do you know where they are?
• Do you know where they are?
• Saulo.And your parents, do you know where they are?
• How do you know where they are?
• Do you really know where they are?
• Do you never know where they are?
• How do you know they are Dickens's?
• Do you know how scary they are?
• Drew, don't you know who they are?
• Granny, do you know what they are saying?
• Do you expect me to believe that you don't know where they are?
• Well, how do you know what flavors they all are?
• Do you know what are they talking about?
• Do you know what are they doing here?
• And how do you know what they are selling?
• Are you seriously suggesting you don't know where they are?