Why was Louis pasteur's last name pasteur?

Answer 1

Because it was his dad's last name and when his mom got married she took his dad's last name. Then they had Louis. So there. That's how you get Louis Pasteur.

Answer 2

Louis Pasteur's last name 'Pasteur' is of French origin and is derived from the word "pasteur," which means a person who holds a church position. The name was likely adopted by one of his ancestors who held a position within the church.