Yes, each unique person has their own profile. That means several persons with the same name exist in the database.

One example: https://www.themoviedb.org/search?language=en-US&query=peyton+list

As you can see they share the same name, but there are lots of different data fields, the IMDb ID being perhaps the most important. And it's good that I checked since someone had added the wrong social media links for the older Peyton List.

From a practical point of view, I have found that images are key to differentiate content. It's not uncommon for a user to add a credit to the wrong profile if that profile has the correct image for the person they are adding.