| Cyra | sun or throne, or lord |
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| Cyrano | from Cyrene |
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| Cyrax | unique |
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| Cyril | lordly, unique |
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| Cyrille | lordly |
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| Cyrus | sun |
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| Czar | Caesar or ruler |
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| Dabney | from Aubigny |
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| Dacey | from the south |
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