Uh... Kiwi, you've put me to shame. Red Walder, White Walda, and Whitesmile Wat are good answers. Even Iron Emmett is good... though Rusty Emmett sounds more descriptive. I was not looking for colors as proper names, eg. Rosey. Nor was I looking for nicknames without a name, eg. Bluetooth and Blackfish. Nor was I looking for animals, eg. Grey Wind.
But you did get the sixth person by naming four! Good job. Since I always give credit to the person getting the last part and not the most (though, I think you did both)... it is now your turn.
For the record, the two rangers I was thinking were Black Bernarr and Brown Bernarr.