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My personal view is that if you plan only calling your child by the nickname, you shoulg just give that as the full name. To me it seems a bit weird to name your child Sarah and then never actually call her that. I think Sadie would be good on it's own. There are some names that are too 'nicknamey' to do so (like "Sammy"), then another full name would be better (like "Sam", not necessarily the longest possibly version like Samuel or Samantha).

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So: I prefer Sadie as a full name, and yes, introducing her as Arielle would make a difference, sicne you're actually using the full name in that case (for the record: I prefer just Ella over Arielle, but not because of the nn thing)