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