The word Samurai is derived from ancient japanese, the verb
to serve is the best direct translation. Since
"That I may serve" is an Arkadian Populist slogan, it seems rather related RP-wise. You can change "ancient japanese" to "anciant aretan" for the game ofcourse
The Samurai were warriors of great skill, and besides fighting, they were trained in all arts of painting, writing poems, brewing tea and soforth. This was part of the
code of honor they followed. It is named
"Bushi-do" in japanese, where
bushi menas warrior and
do means way or road.
"bushido" translates directly to
"The way of the warrior". (On a not particularly related side note, the fighting discipline
Tae-Kwon-Do is formed of the words
Hand,
foot and
way, meaning the way of the body).
Most Samurai were of "noble" birth and had servants to assist them, and were fed by the peasants serving under their lord, typically the head of the family.
The masterless Samurai were called
Ronin, and had, for some reason or another, no master to swear loyalty to. Many of these could not feed themselves and resolved to robberies and raiding parties instead.