Panaretto

I am looking for Panaretto family members and wonder if anyone has done their family tree in which the following names occur? My great grandmother, Panayiotitsa Panaretto born around 1855, lived in Potamos with her husband George Emmanuel Andronicos who came from Kousounari. I am a descendent through my grandfather Theo Andronicos. Can anyone explain why their name was spelled Panaretto and not Panaretos? The smallest clue could be of assistance and I am open to any information. Thank you.