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That's fine. Either spelling works for Erica / Erika. I like both ways... I like the way Erica looks and Erika is because of how it's transliterated from Jpns.
Esther, Eden and Elizabeth are also nice... and Elisa and Eliza (but not in same sibset obviously)... There are also some nice Jpns. E names out there, but I won't bother adding those unless requested... except maybe Erina since it's quite pretty and not far from Erin in sound.