It's actually on my shortlist for a future daughter, but I'm not sure about Dorothea vs Dorothy. Anyway, my combo is Dorothea Lisette. I don't get any vibes from the name itself, but I would be inclined to believe the parents were educated and intelligent. I think it goes well with pretty much any 2 syllable middle name.
Dorothea Alice
Dorothea Clare
Dorothea Ivy
Dorothea Maeve
Dorothea Florence
Dorothea Hazel
Dorothea Olive
Dorothea Charlotte
Dorothea Corrine
Dorothea Fern