Without researching, do you know where the "Jim Crow" in "Jim Crow laws" comes from?

I’m asking for a “Yes” or “No” response. Not a spoiler. A link would be cool if someone wants to open it, but the question is intended as a survey.

I’m sort of a history buff, but I find that I do not know who or what “Jim Crow” is or was. I simply want to know if I’m in the minority. Was I sick that day in history class?