Clansman is clearly the best choice. It fits to the time period/theme and isn't going to offend anyone. Soldier doesn't fit the period/theme but still won't offend anyone. Peasant fits the period/theme but may offend some people.
Ahhhm, duuuh. How about scrap the whole idea of clan titles and lets have colored names according to position. What a colorful chat it would be
No no no no more titles. No words just colors with some fancy symbols beside the name. "Hey, my color cost me a lot of gold." "Hey, green can you open the door?" "Thank you blue." "Welcome brown."