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" Origin: Japanese There are other meanings depending on the kanji used. Written in hiragana it's いさむ.
Atra is the feminine adjective form of āter, a Latin word meaning "dull black, dark", "gloomy, sad, murky", "dismal, unlucky", "and "malevolent, poisonous, malicious". It derives from a Proto-Indo-European root word meaning "fire". Origin: Proto-Indo-European