The history and philosophical origins of evolution far predate Darwin.
Which Darwin?
Which theory of evolution?
When you saw Darwin, are you referring to Charles or Erasmus?
When you say evolution, are you referring to a general statement that living things change over time, a statement that living things are related by descent, a statement that species branch, a statement that change is gradual and incremental or a statement that change occurs in large jump, a statement that some members of a population produce more offspring and pass their particular differences on at a greater rate than other individuals, or a statement that individuals acquire genetic traits during their lifetime and pass these learned traits on to their offspring?
This is not an exhaustive list, but comes from Ernst Mayr, and is considered a pretty good list of the theories associated with the word evolution.
A clever person will note that each item on the list is independent of the others.