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Effie is a very cute nickname, but I tend to prefer a more formal name to fall back on, myself. Behind the Name gives Euphemia as the "full" version, which I actually think is rather charming (Euphemia Louise would be darling), but if that's not to your taste, I've also heard Effie as a nn for Elizabeth, and I'm sure there must be others.

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That said, of your combos I like Effie Louisa and Effie Josephine.