If you click on a villager on the map, it selects the villager, and it opens up a little tooltip showing their name and some info about them. The tooltip follows the villager around as they walk about.
If you click on a villager in the villager list, it moves the map to the villager (I guess), and it selects the villager, but it doesn't show the tooltip. It would be nice if it did.
The reason I discovered this is because my population is getting big, so I wanted to send some people to Limbo to avoid the game slowing down. I decided to send the lowest level people, so I went to the list, scrolled to the bottom, and clicked on the lowest villager. The map view moved, but there were a billion villagers in sight, and I had no idea which was the one I was interested in. I guess it was the one in the middle of the screen at the time I clicked, but they all are rushing around and they quickly scatter, so it's difficult to tell who it is. If the tooltip were there, it would be easy.