In English, it is samurai, singular or plural. This is because it is a class of person.
The plural is bridges.
The plural of "turkey" is "turkeys."
The plural of address is addresses.
The plural form of him, her, or it is them. (objective pronouns)
The plural of cylinder is cylinders.
Samurai.
It is spelled Samurai
Kanji - 侍 Hiragana - さむらい
The plural is hooves.
The plural is cherries.
The plural is cantaloupes.
The plural is resources.
The plural is "emeralds."
The plural is roses.
The plural way to spell studio is studios.
The plural is bridges.
Trout is plural