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Nearly all of them can and do stand alone, although I've not seen anyone called Tilda or Fran who was named that at birth.
I think your average non-namenerd probably thinks of Sadie & Liam as names in their own right, & isn't even aware of the connection with Sarah or William - & both my husband and myself had Victorian relatives called just Eliza.
I wouldn't personally use any of them as full names though.