Over time, the surname Fatthy has undergone some changes in its spelling or pronunciation.
It is common to find surnames similar to Fatthy. This is because many times the surname Fatthy has undergone mutations.
Errors in writing, voluntary changes by the bearers, modifications for language reasons... There are many reasons why the surname Fatthy may have undergone changes or modifications, and from those modifications, surnames similar to Fatthy may have appeared, as we can see.
Discerning whether the surname Fatthy or any of the surnames similar to Fatthy came first is not always easy. There are many reasons that could have led to the surname Fatthy being written or pronounced differently, giving rise to a new, different surname Fatthy with a common root.