Has DNA testing confirmed that an alternate surname spelling is related?

There are many variant spellings of surnames that seem so closely related that they would seem to have come from a similar root.? Perhaps the spelling was changed unintentionally by a census taker or an immigration official, or maybe an ancestor decided to spell his name in a different manner for any number of reasons.? One such surname we are working with is Teaff, Marilyn's maiden name.? It is pronounced very much like the fairly common Irish surname Taaffe, but no link has been proven.? We have had some Teaff DNA tested, but now we are waiting to have a Taaffe come forward to be tested, to see if the families are related.? Have you had any success in proving or disproving, a link between variant surnames?
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