Hi,

If the name was written דודה, it is most certainly not pronounced Doda but Duda. Dodo would be spelled דאדא in Yiddish with the proper punctuation for the vowels. 

To remove any doubt, I suggest you include a scan from the document/matzeva from which you found this name.
As I mentioned previously it could be a confusion between ד and ר, which would become Dora, a much more common name corresponding most likely to Dvora in Hebrew.

Best,

Yosef Kutner