LINKED CONTACTS ARE TWO OR MORE CONTACTS COMBINE TOGETHER, TO MAKE LIFE EASIER WITH HANDLING MANY SAME CONTACTS
UNKNOWN/INFO IS A SINGLE CONTACTS.
I have the solution for this, so please full attention here to get it correctly. I found the steps from the iOS 6 manual.
Link a contact: Edit a contact, tap Edit, then tap and choose the contact entry to link to.
Linked contacts aren’t merged. If you change or add information in a unified contact, the
changes are copied to each source account where that information already exists.
If you link contacts with different first or last names, the names on the individual cards won’t
change, but only one name appears on the unified card. To choose which name appears when
you view the unified card, tap the linked card with the name you prefer, then tap Use This Name
For Unified Card.
View contact information from a source account: Tap one of the source accounts.
Unlink a contact: Tap Edit, tap , then tap Unlink
First Step: Edit contacts
Second Step: Scroll down & Click + symbol
Third Step: Click linked contacts (choose your contact that you want to be linked if the contact you are in)
Fourth Step: Click done
Fifth Step: Go to LINKED CONTACTS
Sixth Step: Choose your prefer name ex. Facebook: Taylor Rocker
iCould: Taylor Swift
Seven Step: EXAMPLE: I choose iCould to be my prefer name.
Click on iCould: Taylor Swift
There will be a new button appear which is "Use This Name For Unified Card"
FYI: IF FACEBOOK NAME AND ICOULD NAME ARE THE SAME OR A BIT DIFFERENT, YOU CANNOT CHOOSE WHICH NAME YOU WANT TO BE APPEAR.