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It depends on the name and whether there is much a historical precedent for it being used as a full name. For example, I think Liam, Jack, Mia, Kate or Sadie (just to name a few) can stand alone as a fn, even if I personally prefer them as nicknames. Nicknames like Josie, Susie, Ricky or Johnny should be only used as nicknames as they don't age well IMO.

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In general, I prefer a longer name and then using a nickname because it gives the child more options as they grow.