In March of 2000, Paul Ward received a letter from RJ in which he listed what some of the regional accents of Randland sound like:

* Two Rivers - Irish/English
* Illianers - Dutch
* Aiel - somewhat Slavic
* Tairen - Spanish
* Domani - Indian
* Saldaean - Egyptian/North African
* Seanchan - Texas

This entry in the FAQ also has a good description of the real world influences on Randland nations.

Hope that helps!