Euthemia

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Euthemia (ευθυμία; /ɛfθiːmˈiːə/), phonetically transliterated as Efthymia, is a Greek female given name, meaning "of a good disposition".

It is derived from the ancient Greek words ευ (good) and θυμός (disposition). The diminutive Effie is a pet form of Euthemia.