That might be a holdover from an old English pronunciation, similar to pronouncing the final a like a y as in Virginny (Virginia), Loretty (Loretta), Alabammy, et al. We used to hear this when we visited Appalachia, but the entire, once very distinctive Appalachian dialect seems to be disappearing rapidly.
My roots are from Arkansas. Where they add an R at the end of a word.
El Dorado? Pronounced Elder Raider.
My cousin Rebecca: Rebeccer.
Hollow: Holler.