I am researching the Monteleone in Alia.I have seennames changed in spelling such as Salvadore becoming Salvatore.I also have mystery that may shed light on yours. My Grandfather's birth record has a Liborio Monteleone as father.All but one of his sibling has the same name except one which has a Cosimo Liborio Monteleone.I have not been able to find any evidence of a Liborio Monteleone before the birth of his first child. I have found a Cosimo Maria Monteleone that fits age, parents, and spouse.I have a marriage record of Cosimo which has him married to Cosima Tripi, my grandfather's mother and Liborio's wife. Conclusion:They are the same person.For some unknown reason, he changed his name between his marriage in 1869 and the birth of his first child in 1870. I hope this sheds light on your mystery.