I think Millicent and Winnifred would be cute because you can shorten them to Millie and Winnie

The first one that comes to mind is this one from probably the early 90s. From what I remember it was a group of kids and one of them is sick or something and the other kids try to save him? In the end they each sacrifice a year of their life so that the sick friend can live. I wanna say Steven Spielberg was a producer.

There was also that one crossover movie where a bunch of cartoon characters from whatever was popular in the 80s did an anti-drug movie.