"Two babies, no!"
Ryan, my three year old, said "Two babies, no!" when they were on either side of his tricycle, preventing him from backing up and getting away from them. He has never tried to say their names, but I guess "Alexander" and "Christopher" are mouthfuls to a 3 year old. (Alexandopher is even harder LOL!) Usually he will call them "baby" and "other baby." However, my oldest son was attempting to teach him how to say "Michigan" and "wolverine" tonight, and he was doing pretty well, so maybe there's hope.
My oldest and I thought "Two babies, no!" was pretty funny, so we have been using that also whenever they are both doing something they shouldn't be, which is frequently.