Heh, this is how our races are:
Elves = French
Gnomes = Irish/Scottish
Dwarves = German/Rumanian/Russian
Halflings = Texan or other deep south (Howdy partner)
Half-Orc = They are very gruff and dumb sounding, using simple words. One player had his Half-Orc character speaking like Warf from Star Trek.
We have other species that we ran into which took on such characteristics. Our Treants are Canadian!
We also have regional slang. For example, the children that live in the slums of a bustling city have that street talk. Basically, Ebonics. Think of how your average Rapper talks, you'll get the drift. What up, G?
It makes for a very entertaining session. Especially because people tend to inadvertantly drift to the different accents. When the Elf (Frenchman) is speaking, the Dwarf (German) who answers him accidentally speaks in the French accent because it is so contagious. I did this so much during our game that when I leveled up, I took Elvish as my language just so I had an excuse as to why I kept drifting into that accent.
Hehe, good times, good times...