PokerTracker

One of my regular villains has changed screenname. It's obviously the same person as the new name is only one letter different from the previous one and he's from the same (slightly obscure) country. I have a lot of data on him under his old name and would like that to come up on the HUD under his new name. Can I somehow combine these "two players" so they become a single player with the new name?

yes you can. But at first i would be concerned if its really the same player or just a "faker".
If you want to add those two players together, see this https://www.pokertracker.com/guides/PT4 ... me-aliases