I think
Delphine is very elegant and beautiful. I'm not big on the nn Delphie, though. I think
Delphine is just fine on it's own, but if you wanted to use a nn I'd suggest Del or Delly or something of that nature.
Some combos:
Delphine MariaDelphine LaylaDelphine Theresa /
TeresaDelphine PatriciaDelphine ChristinaDelphine Isabel
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"I've always liked everybody. I'm not sure everybody likes me."-Johnny Depp