No clue what Americans might think, but here in South
Africa we're perfectly used to
Magdalene,
Magdalene etc shortening to Daleen, which sounds much the same because we don't pronounce the r, or not in English anyway.
Personally, I don't have strong feelings about Daleen either way, but I do find
Arlene,
Darlene,
Marlene etc to be rather down-market.