The fact that there was no unified spelling for the surname Amadiya when the first surnames were formed allows us to find many surnames similar to Amadiya.
Errors in writing, voluntary changes by the bearers, modifications for language reasons... There are many reasons why the surname Amadiya may have undergone changes or modifications, and from those modifications, surnames similar to Amadiya may have appeared, as we can see.
Discerning whether the surname Amadiya or any of the surnames similar to Amadiya came first is not always easy. There are many reasons that could have led to the surname Amadiya being written or pronounced differently, giving rise to a new, different surname Amadiya with a common root.