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This might come down to sound. When I say them, Theodora has a definite door in it, but the first o in Dorothea is short and the second is a schwa.

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I knew a Dorothea at school who was never known by any nn at all; and now I know a Theodora who hates it with a passion and is universally known as Theo.

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On balance, then, it's Dorothea for me.