I was guessing masculine too and most others seem to agree. I was thinking dee AHN iss (end part rhymes with
Adonis) for the pronunciation.
I agree that it is probably related to the other
Dion- names.
If I used it,
Dion (dee AHN) would be a nn possibility.
Drewell (
Drew) ,
Donovan, and Dionis (
Dion) do go well togehter I think.