Isamu is a Japanese male name with a variety of meanings depending on the kanji used:
- isamu 勇 “courage”;
- isamu 勲 “merit; distinguished service”;
- isamu 敢 “daring; brave; bold; sad; tragic; pitiful”;
- isamu 武 “warrior; military; chivalry; arms”;
- isamu 力 “power; strength; force”
There are other meanings depending on the kanji used. Written in hiragana it’s いさむ.