Casimir Funk
After reading an article by a Dutchman named Christiaan Eijkman, which said that people who ate brown rice were less likely to get beri-beri compared to those who only ate fully milled rice, a scientist named Funk tried to find the specific substance responsible for this. He was successful and named it "vitamine" because it contained an amine group. It was later called vitamin B3 (niacin), even though he initially thought it would be vitamin B1 (thiamine) and described it as the "anti-beri-beri-factor.