Having no huge racial separation in biology Humans make a massive distinction by nationality.

Forbidden Cathay, [Tieshan] (Song Dynasty)Novus Ordo, [Teresh] (Freebooters, Smugglers, Seawolves, and Reavers)Kalishi Khaganate, [Ethangari] (Eurdite and Enlightened Sages of Vast and Terrrible knowing.)
Volovik [Norn] (Russian Vikings)Valsguarde [Iverni] (Valkyrie, & Bogatyr)Athos [Thelitos],  (Democratic Greece)
Theteros, [Thelitos] (Spartan Rome)Catalan , [Kashmiri] (Buccaneers and Corsairs)

This isn't the END of all possible nations. BUT it is the basis for player characters.  You NEED NOT have come from the Central Empire, which is what the above nationalities are from - HOWEVER your parent came from there if you decide to have lived elsewhere.

Other Known nations include:
Imhullu Khans or The Tuigan, [Tieshan] (Mongol Barbarians)Zinkalo,  [Skalo] (Roving Gitano)Kush, [N'dongo] (Feverthorn Jungle tribesmen)
Cherkess,  [Chalav] (Viking Romani- Mobsters)Nihon or Hanshugan [Yashima] (Japanese Shogunate)Vendhyan, [Bakhara] (India Rajput Sultanate)

There are colonies within the nations which represent cultural distinctions for ALL nations.

Savage
Nomadic
Civilized
Savages include warriors from the frozen north and witchdoctors from the snake-infested jungles of the south.
Nomads roam the empty wastes beyond the civilized cities; quick to strike and bound by no laws.
In the civilized lands dwell, noble knights, wise kings, and learned sages — as well as greedy merchants and cunning thieves.
Enlightened
Decadent
Degenerate
A few great civilizations will rise above all others gaining a half-mythical status.
All that rises must eventually fall as all great civilizations reach their peak and eventually start to decline.
The last survivors of decadent civilizations start to feud over dwindling resources or are driven away by stronger cultures.