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I think these ones are good twin names:
Susanna and Lilian
Melanie and Layla
Leah and Tabitha
Elodie and Odetta
Leda and Silvia
Patricia and Isobel
Theodor and Dorothea - Theodore and Dorothy would be nice

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And these ones aren't:
Elisabeth and Isabella - they're basically the same name
Vlastimil and Patrick - too mismatchy to be siblings
Pollux and Kastor - too themey (and I think they're terrible names)
Romulus and Remus - too themey