You can see many of their ethnicities on their singlets.
Be warned that these are guesses. Some of almost certainly wrong, and the spellings of names are defnitely wrong.
I think it's Gogchelidze (Russia) in the world finals at 2:52. The Canadian doing the leg sweep at 3:30 might be Ugolah, I'm not sure. 5:10-5:20 is Romero (cuba) vs Adam Saitiev (Russia). 6:55 is Dabir (Iran) vs Botanev (Russia), where Dabir protested that he wasn't ready and Botanev's throw didn't count, 7:15 is Siassouri (Canada) throwing Purveytaar (Mongola) in OT to win the world title, 7:30 might be Samargashuev (Russia) , Dremiel Byers (USA) dancing at the end.