Just to complicate matters slightly, the original spelling is d'Arcy. It's not a name I would use because it bears no relationship to the names of any of my deceased ancestors, but if I were to use it, I would be sore tempted to keep the apostrophe. If I resisted the apostrophe temptation, I would use Darcy since that is closest to the original spelling.
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I've seen it spelled Darcy and Darcey. I would probably go with Darcy, but it's a toss up between the first two options for me.
Just to complicate matters slightly, the original spelling is d'Arcy. It's not a name I would use because it bears no relationship to the names of any of my deceased ancestors, but if I were to use it, I would be sore tempted to keep the apostrophe. If I resisted the apostrophe temptation, I would use Darcy since that is closest to the original spelling.
Definitely Darcy.
Another vote for Darcy.
Darcy.
Darcy :)
My coworker is named Darcy and that's how she spells it, so I vote for Darcy.