Hi
Butting in 'cause I see Steve's not on line and you are..
If you bear in mind that a lot of peolpe could not read or write, so the emunerator wrote down what he heard. Depending on how the person spoke depends what was written, and the person wouldn't know if that was right or wrong. Sometimes it was not even the person involved who gave the info, so that leaves it open to all sorts of mis-spellings wrong ages etc. So I would say your on to the right person.
Just imagine an Irish man saying Johanna. no offence meant.
dave