[Facts] Re: Help with Spanish names & others
A Spanish-speaker would pronounce Scarlet and Stephanie as "Escarlet" and "Estephanie," so they would be considered spelling variants of the same name. But since an English-speaker would perceive them as different names, I don't think you should combine them. To me, Scarlet and Escarlet are as different as Stella and Estella.
But if you were making a list of names used only by Spanish-speakers, then I would combine them.