1) Darwin 
• (n.) One skilled in evolutions. • (n.) one who holds the doctrine of evolution, either in biology or in metaphysics.
Ev`o·lu'tion·ist noun 1. One skilled in evolutions. 2. one who holds the doctrine of evolution, either in biology or in metaphysics. Darwin. 
evolutionist 1. Someone who believes in or supports a theory of evolution; especially, in biology. 2. A person who supports a policy of gradual growth or development rather than sudden change or expansion.
noun a person who believes in organic evolution
a person who believes in or supports a theory of evolution, esp. in biology. · a person who supports a policy of gradual growth or development rather than sudden change or expansion.