Boy or girl?
I guess a girl could be
Nia or Sisi.
A boy is much harder.. but I actually like the full name
Sydney enough that I wouldn't want to nickname it. It's only two syllables so it doesn't really need it.. I suppose a boy could be
Den with a bit of a stretch.
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Sol Santiago,
Indigo Makaio, Aila
Celandine and
Saskia Rose (Saska)