i change every villagers' name.

LOL!

I rename them, but not often. I only rename them when they remind me of something or someone, or I feel like it.

I sometimes rename a favorite villager, or have a theme if I have a small population, but never over 35 villagers.

I rarely do change the whole name, but sometimes I add middle and/or last names

If there's a duplicate I change it (Of course!), but sometimes I just modify the names a tiny bit!

I change most of them

I do for duplicates, and the names "Swahili", (I think that having a villager named after a language that I'm learning is a bit too comical) and "Konichua" (it's spelled "konichi wa").
They get replaced with Swahili names, like Hatima (destiny).

Sometimes, I name villagers after a parent ([Name] II).

I also change the names of the people who dislike running to [space], as they don't deserve names. >:O

I like to go through the alphabet (naming the oldest man Adam, the next Benjamin ect.)to help me remember ages and keep an eye on the 13 yr olds to make sure I get them working as soon as they turn 14. But once all the goals are met and there is less to do I tend to just leave them their original names and worry less about how productive they are in their lives.

I'm into genealogy and I'm researching my ancestors in France. So, I name my original Villagers the French names of my kinfolk ... Francoise, Susanne, Maguerite, Maria, Jean-Pierre, Etienne, Caterina, Nicolaus, etc. It helps me remember which is which. I don't normally rename any of the Heathens. However, if any of the heathens are a pain in the butt, they get a special name or colored outfit marking them for an early grave with the Time Warp, just to be rid of them. LOL